Question

3. The only solution of the equation x^2 + bx + 16 = 0 is
x = 4. What is the value of b?

A.) b = –16

B.) b = –8

C.) b = 8

D.) b = 16

Answer 1

$4^2+b\cdot4+16=0\\ 16+4b+16=0\\ 4b=-32\\ b=-8$