Answer:
x=4 x=-1
Explanation:
2x^2-6x-8
Factor out a 2
2(x^2 -3x-4)
What 2 numbers multiply to -4 and add to -3
-4 *1 = -4
-4+1 = -3
2(x-4)(x+1)
Set this equal to zero to find the zero's
2(x-4)(x+1) =0
Using the zero product property
x-4 =0 x+1 =0
x=4 x=-1