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Quadratic FactorisingLearning Objective:

- to be able to factorise quadraticexpressions when the co-efficient of x2 isnot 1

Tracking CGrade B / A

Key words: quadratic, factorise, co-efficient

Starter: which of the following is a factor of x2 6x + 8 ?

a)x + 8

b)x + 2c)x 2d)x + 4

How do you know? What is the other factor?

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Challenge

Can you complete the algebra challenge?

Positive referrals will be given for thefirst 3 people to correctly assemble thetriangle and stick it in their books.

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Complete these factorisedexpressions

a) x2 + 5x + 4 = (x + 1) ( ................. )

b) 2x2

+ 3x + 1 = (2x + 1) ( ................... )

c) 3x2 + 8x + 4 = (3x + 2) ( ..................... )

d) 5x2 -7x 6 = ( ....................... ) (x 2)

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3x2 + 16x + 5