1.1 Write Complex Numbers. Vocabulary A number r is a square root of a number s if r 2 = s. The...
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Transcript of 1.1 Write Complex Numbers. Vocabulary A number r is a square root of a number s if r 2 = s. The...
1.1 Write Complex Numbers
Vocabulary
• A number r is a square root of a number s if r2 = s.
• The expression is called a radical.
– The symbol is a radical sign and the number s beneath the radical sign is the radicand of the expression.
s
Vocabulary
• Product Property of Radicals
• Quotient Property of Radicals
ab a b a a
b b
Vocabulary
• The imaginary unit i is defined as
2
-1
-1
i
where
i
Vocabulary
• A complex number written in standard form is a number a + bi where a and b are real numbers. – The number a is the real part of the complex
number, and the b number is the imaginary part.
– Example: 2 + 3i
Real Part
Imaginary Part
Vocabulary
• If b = 0, then a + bi is an imaginary number.
• If a = 0 and b = 0, then a + bi is a pure imaginary number. – 0 + bi = bi
(there is not an real part…NO “a”)
Vocabulary
• Two complex numbers a + bi and c + di are equal if and only if a = c and b = d.
• For example, if x + yi = 5 – 3i, then x = 5 and y = -3
Example 1:
• Simplify the expression
a)
b)
8 6
5
36
Example 2:
• Write complex numbers in standard forma)
b)
c)
d)
25
3
12
4 16
Example 3:
• Find real numbers x and y to make the equation true.
1) 4x – 4yi = 8 – 12i
2) 5x + 3yi = 10 + 18i
Classwork
• Out of your notetaking guide
pg. 4 – 5 ALL