Question

Solve
`x^2-8x-9=0` algebraically

Answer 1

x=9 x=-1

Explanation:

We can factor

x^2 -8x-9 =0

What 2 numbers multiply to -9 and add to -8

-9*1 = -9

-9 +1 = -8

(x-9) (x+1) =0

Using the zero product property

x-9 =0 x+1 =0

x=9 x=-1