Question

How do I factor the following expressions:
1. -x^2 – x + 20

2. x^2 + 10x - 75

Answer 1

probably easier to factor \(-(x^2+x-20)\)

Answer 2

?

Answer 3

1. (x+5)(4-x)

2. (x+15)(x-5)

Answer 4

When you see a negative coefficient for the first variable, try factoring out the -1 is what satellite73 is saying.

Then simply use trinomial factoring, do you know how to do that?

Answer 5

I'm a little behind, so Im not too familiar with it yet

Answer 6

Watch this, only 5 mins: http://www.khanacademy.org/math/algebra/polynomials/v/factoring-trinomials-by-grouping-2

Answer 7

oh ok cool