Originally Posted by

**mcaelli** Ok guys, sorry if im posting this in the wrong section; dont know where quadratics belong.

Anyway, so I have a maths test next week, and my maths teacher handed out practice tests (from years back) for us to get a look at what we're dealing with. Anyway, im going pretty well with it, except theres 1 question im stuck at. Could you please help me do it?

Question: Factorize each of the following expressions, over R if necessary.

1)$\displaystyle 16x^2-81$

2)$\displaystyle x^2+4x-5$

3)$\displaystyle -7(x-3)^2+63$

4)$\displaystyle 2x^2-22x+8$

5)$\displaystyle 7(9+5)^2 -6(9+5)-1$

Thanks