MathDB

There are two values of

a

for which the equation 4x^2 \plus{} ax \plus{} 8x \plus{} 9 \equal{} 0 has only one solution for

x

. What is the sum of these values of

a

? (A)\ \minus{}16\qquad (B)\ \minus{}8\qquad (C)\ 0\qquad (D)\ 8\qquad (E)\ 20

Problem Statement