X² - 8x - 20

Factor the quadratic completely

(x+-10) (x+2)

Step-by-step explanation:

Whenever there is a x²

we can always start off with

(x+_) (x+_)

then we take the rest of the eqn - 8x - 20

the b value is what be always add to and the c value is what we factor. So what factor pair of 20 adds to - 8?

its - 10 & 2 because its = 20 and when you add it together its - 8

Then you plug it in:

(x+_) (x+_)

(x+-10) (x+2)