Question

The zeros of the polynomial x²+7x +12 are
(A) -4, -3
(B) 4, 3
(C) 4, -3
(D) -4, 3

Answer 1

Answer: (A) -4, -3

We have,
f(x) = x² + 7x + 12
Now, put f(x) = 0
x² + 7x + 12 = 0
x² + 4x + 3x + 12 = 0
x(x + 4) + 3(x + 4) = 0
(x + 4) (x + 3) = 0
x + 4 = 0 or x + 3 = 0
x = -4 or x = -3
So, the zeros of given polynomial are -4 and -3.