Factoring the Difference of Squares - Miami Arts Charter€¦ · Factoring Difference of...
Transcript of Factoring the Difference of Squares - Miami Arts Charter€¦ · Factoring Difference of...
Factoring Difference of Squares[InClass Version][Algebra 1].notebook
1
September 17, 2017
Sep 174:23 PM
Homework Assignment
The following examples have to be copied for next class
Example 1
Example 2
Example 3
Example 4
Example 5
Example 6
The examples must be copied and ready for me to check once you come to class.
Factoring Difference of Squares[InClass Version][Algebra 1].notebook
2
September 17, 2017
Aug 275:49 PM
Factoring the Difference of Squares
Factoring Difference of Squares[InClass Version][Algebra 1].notebook
3
September 17, 2017
Jul 3012:33 PM
Example 1
SOLUTION
Factor the expression : 12x3 – 75x
GCF = 3x
3x(4x2– 25)
(12x3 – 75x)
Find the GCF.
Factor out the GCF.
Factoring Difference of Squares[InClass Version][Algebra 1].notebook
4
September 17, 2017
Jul 3012:45 PM
If the expression is a binomial check if both terms are perfect squares.
3x(4x2 – 25)PERFECT
SQUAREPERFECT
SQUARE
If both terms are perfect squares the last thing that must be checked is that there can only be a subtraction(minus) sign between both terms.
3x(4x2 – 25)PERFECT
SQUARE
PERFECT
SQUARE
SUBTRACTION
SIGN
Factoring Difference of Squares[InClass Version][Algebra 1].notebook
5
September 17, 2017
Jul 301:07 PM
3x(4x2 – 25)
3x( )( )
If a term was factored out of the original expression place this term outside of the first parentheses.
The 1st term in each parentheses is the square root of the 1st term in the binomial.
3x(4x2 – 25)
3x(2x )(2x )
Factoring Difference of Squares[InClass Version][Algebra 1].notebook
6
September 17, 2017
Jul 301:18 PM
The 2nd term in each parentheses is the square root of the 2nd term in the binomial.
3x(4x2 – 25)
3x(2x 5)(2x 5)
Factoring Difference of Squares[InClass Version][Algebra 1].notebook
7
September 17, 2017
Jul 301:35 PM
3x(4x2 – 25)The sign in front of the 25 is a subtraction sign this means that this number is really –25. The only way that two real numbers can be multiplied so that the product is –25. If one of the number is positive and the other number is negative.
3x(2x – 5)(2x + 5)
3x(2x + 5)(2x – 5)OR
Final step is too determine the sign that goes inside of each parentheses.
Factoring Difference of Squares[InClass Version][Algebra 1].notebook
8
September 17, 2017
Jul 301:50 PM
Example 2
SOLUTION
Factor the expression : 98x – 18x3
GCF = 2x
2x(49 – 9x2)
Find the GCF.
Factor out the GCF.
(98x – 18x3)
Factoring Difference of Squares[InClass Version][Algebra 1].notebook
9
September 17, 2017
Jul 301:50 PM
If the expression is a binomial check if both terms are perfect squares.
PERFECT
SQUAREPERFECT
SQUARE
If both terms are perfect squares the last thing that must be checked is that there can only be a subtraction(minus) sign between both terms.
PERFECT
SQUARE
PERFECT
SQUARESUBTRACTION
SIGN
2x(49 – 9x2)
2x(49 – 9x2)
Factoring Difference of Squares[InClass Version][Algebra 1].notebook
10
September 17, 2017
Jul 301:50 PM
2x( )( )
If a term was factored out of the original expression place this term outside of the first parentheses.
The 1st term in each parentheses is the square root of the 1st term in the binomial.
2x(49 – 9x2)
2x(7 )(7 )
2x(49 – 9x2)
Factoring Difference of Squares[InClass Version][Algebra 1].notebook
11
September 17, 2017
Jul 301:51 PM
The 2nd term in each parentheses is the square root of the 2nd term in the binomial.
3x(7 – 3x)(7+3x)
2x(49 – 9x2)
Factoring Difference of Squares[InClass Version][Algebra 1].notebook
12
September 17, 2017
Jul 304:53 PM
Example 3
SOLUTION
Factor the expression :
GCF = 1Find the GCF.
Recall from a previous lesson that if your GCF is 1. If it is factored out of the expression the expression will remain the same.
If the expression is a binomial check if both terms are perfect squares.
PERFECT
SQUARE
PERFECT
SQUARE
121 – 81x2
121 – 81x2
Factoring Difference of Squares[InClass Version][Algebra 1].notebook
13
September 17, 2017
Jul 304:53 PM
If both terms are perfect squares the last thing that must be checked is that there can only be a subtraction(minus) sign between both terms.
SUBTRACTION
SIGN
PERFECT
SQUAREPERFECT
SQUARE
121 – 81x2
If a term was factored out of the original expression place this term outside of the first parentheses.
121 – 81x2
( )( )
Factoring Difference of Squares[InClass Version][Algebra 1].notebook
14
September 17, 2017
Jul 304:53 PM
The 1st term in each parentheses is the square root of the 1st term in the binomial.
121 – 81x2
(11 )(11 )The 2nd term in each parentheses is the square root of the 2nd term in the binomial.
(11 – 9x)(11+9x)
121 – 81x2
Factoring Difference of Squares[InClass Version][Algebra 1].notebook
15
September 17, 2017
Jul 305:13 PM
Example 4
SOLUTION
Factor the expression :
GCF = 1Find the GCF.
Recall from a previous lesson that if your GCF is 1. If it is factored out of the expression the expression will remain the same.
If the expression is a binomial check if both terms are perfect squares.
PERFECT
SQUARE
25x2 – 49y2
PERFECT
SQUARE
25x2– 49y2
Factoring Difference of Squares[InClass Version][Algebra 1].notebook
16
September 17, 2017
Jul 305:16 PM
If both terms are perfect squares the last thing that must be checked is that there can only be a subtraction(minus) sign between both terms.
SUBTRACTION
SIGN
PERFECT
SQUAREPERFECT
SQUARE
If a term was factored out of the original expression place this term outside of the first parentheses.
( )( )
25x2 – 49y2
25x2– 49y2
Factoring Difference of Squares[InClass Version][Algebra 1].notebook
17
September 17, 2017
Jul 305:17 PM
The 1st term in each parentheses is the square root of the 1st term in the binomial.
(5x )(5x )The 2nd term in each parentheses is the square root of the 2nd term in the binomial.
25x2 – 49y2
25x2 – 49y2
(5x + 7y)(5x – 7y)
Factoring Difference of Squares[InClass Version][Algebra 1].notebook
18
September 17, 2017
Jul 305:18 PM
Example 5
SOLUTION
Factor the expression :
GCF = 2xFind the GCF.
18x3+ 32x
Factor out the GCF.
(18x3+ 32x)
2x(9x2+ 16)
Factoring Difference of Squares[InClass Version][Algebra 1].notebook
19
September 17, 2017
Jul 305:23 PM
If the expression is a binomial check if both terms are perfect squares.
PERFECT
SQUARE
2x(9x2 +16)PERFECT
SQUARE
If both terms are perfect squares the last thing that must be checked is that there can only be a subtraction(minus) sign between both terms.
ADDITION
SIGN
2x(9x2 + 16)PERFECT
SQUARE
PERFECT
SQUARE
Factoring Difference of Squares[InClass Version][Algebra 1].notebook
20
September 17, 2017
Jul 305:30 PM
Because sign between both terms is an addition this expression cannot be factored further over the set of real numbers.
2x(9x2 + 16)
Factoring Difference of Squares[InClass Version][Algebra 1].notebook
21
September 17, 2017
Jul 305:34 PM
Example 6
SOLUTION
Factor the expression :
405x5 – 80x
GCF = 5x
5x(81x4 – 16)
Find the GCF.
Factor out the GCF.
(405x5 – 80x)
Factoring Difference of Squares[InClass Version][Algebra 1].notebook
22
September 17, 2017
Jul 305:37 PM
If the expression is a binomial check if both terms are perfect squares.
PERFECT
SQUARE
5x(81x4 – 16)PERFECT
SQUARE
If both terms are perfect squares the last thing that must be checked is that there can only be a subtraction(minus) sign between both terms.
SUBTRACTION
SIGNPERFECT
SQUARE
PERFECT
SQUARE
5x(81x4 – 16)
Factoring Difference of Squares[InClass Version][Algebra 1].notebook
23
September 17, 2017
Jul 305:40 PM
5x( )( )
If a term was factored out of the original expression place this term outside of the first parentheses.
The 1st term in each parentheses is the square root of the 1st term in the binomial.
5x(81x4 – 16)
5x(81x4 – 16)
5x(9x2 )(9x2 )
Factoring Difference of Squares[InClass Version][Algebra 1].notebook
24
September 17, 2017
Jul 305:43 PM
The 2nd term in each parentheses is the square root of the 2nd term in the binomial.
5x(9x2+ 4)(9x2– 4)
5x(81x4 – 16)
5x(9x2+ 4)(9x2– 4)The 2nd parentheses is an expression that is the difference of squares. Repeat the process again with the expression inside the 2nd parentheses.
Factoring Difference of Squares[InClass Version][Algebra 1].notebook
25
September 17, 2017
Jul 305:47 PM
5x(9x2+ 4)(9x2– 4)
5x(9x2+ 4)( )( )
The 1st term in each parentheses is the square root of the 1st term in the binomial.
5x(9x2+ 4)(9x2 – 4)
5x(9x2+ 4)(3x )(3x )
Factoring Difference of Squares[InClass Version][Algebra 1].notebook
26
September 17, 2017
Jul 305:49 PM
The 2nd term in each parentheses is the square root of the 2nd term in the binomial.
5x(9x2+ 4)(9x2 – 4 )
5x(9x2+ 4)(3x – 2)(3x+2)