Expand and simplify 5 - (2-x)^2

**FailInMaths** · September 26th 2011, 06:33 AM

Question: Expand and simplify $5-(2-x)^2$

Ok, I know the first step is to do change the negative thingy but I don't know how to. It doesn't seems to make sense to me, can someone share their first step on solving this problem? It's frustrating.........

**Plato** · September 26th 2011, 06:37 AM

Originally Posted by FailInMaths

Question: Expand and simplify $5-(2-x)^2$
Ok, I know the first step is to do change the negative thing

No it is not. First, expand.
$5-(4-4x+x^2)$

**FailInMaths** · September 26th 2011, 06:48 AM

Originally Posted by Plato

No it is not. First, expand.
$5-(4-4x+x^2)$

Oh, I am starting to see something, so after this I just have to evaluate?

Answer: 1+4x-x^2 ?

**Plato** · September 26th 2011, 06:54 AM

Originally Posted by FailInMaths

Oh, I am starting to see something, so after this I just have to evaluate? Answer: 1+4x-x^2 ?

Yes.

**FailInMaths** · September 26th 2011, 07:03 AM

Originally Posted by Plato

Yes.

Thank you!

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