Question

Which of the following are solutions to 2x^2 - 8x - 90? Select all that apply. A) 2, B)-5, C)-7, D)9, E)15, F)5, G)7

Answer 1

2x^2 - 8x - 90
= 2 (x^2 - 4x - 45)
= 2 (x - 9)(x + 5)

so
x - 9 = 0; x = 9
x + 5 = 0; x = -5

solutions -5 and 9

answer
B)-5
D)9