Answer:
x = -4 (multiplicity 2)
Step-by-step explanation:
x^2 + 8x + 16 = 0
You need 2 numbers whose product is + 16 and whose sum is +8.
They are +4 and + 4 so the factors are:-
(x + 4)(x + 4)
(x + 4)(x + 4) = 0
x = -4 (multiplicity 2)
(There are 2 zeroes each of value -4)
