Question

21. If x2 - 4x - 12 = 0, what is the value of 2x^2 – 8x?
A) 0
B) 4
C) 12
D) 16
E) 24​

Answer 1

Answer:

multipl eqn by 2, we get

2x^2-8x-24=0

2x^2-8x=24

ans is E) 24