Question

There are two values of m for which the equation 4x2

+ mx + 8x + 9 = 0 has only one solution for x.

The sum of these two value of m is

Answer 1

D = 0
${(m + 8)}^{2}$-4.4.9= 0
m + 8 = ± 12
m = 4, – 20
sum = 4 – 20 = – 16.

Answer 2

I don't know ke that answer sorry