Question

Factorise completely


`1) {x}^(2) - 12x - 13`

`2){32y}^(2) + 8y`

`3) {x}^(2) - 9`

Answer 1

1. Number that adds up to -12 and multiplied by the same # that gives u -13. Set it up like this because both are negative so, u need 1 negative and 1 positive.
(x-13)(x+1)

2. Same rule applies. GCF
8y(4y+1)

3. (x+3)(x-3)