I need help with factorising the following:

a) (c+d)^2 - d^2

I got c^2 + 2cd + d^2 - d^2 which is equal to c^2 + 2cd, is this correct please?

b) 2w^2 + w - 3

How do you do this again please (need simple and clear advice)? Thanks

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- February 5th 2011, 10:03 AMNatasha1Factorising a quadratic
I need help with factorising the following:

a) (c+d)^2 - d^2

I got c^2 + 2cd + d^2 - d^2 which is equal to c^2 + 2cd, is this correct please?

b) 2w^2 + w - 3

How do you do this again please (need simple and clear advice)? Thanks - February 5th 2011, 10:14 AMTheEmptySet
- February 5th 2011, 10:25 AMArchie Meade
- February 5th 2011, 11:25 AMskoker
here is how i did the first equation. is a positive perfect square.

expand perfect square.

collect d squared terms they cancel.

factor out c.