Question

Can somebody help me with 16?

Answer 1

expand the expression: 4ax²-4x+4ax-4-x²+4=bx
combine like terms: (4a-1)x²+(4a-4)x=bx
there is no x² on the right side, which means 4a-1=0, a=1/4
4a-4=b
4(1/4)-4=b
b=-3
B is the correct choice.