Answer:

a = -2, b = -8, c = 7

so c. -8 :)))

Answer:

b.-8

Step-by-step explanation:

rearrange

-2x^2+7=8x

add -8x on both sides

-2x^2-8x+7=8x-8x

simplify

-2x^2-8x+7=0

so b=-8