Question

The zeros of the polynomial x²+3x -10 are
(A) 2, -5
(B) -2, -5
(C) 2, 5
(D) -5, -2
 

Answer 1

Answer:(A) 2, -5

We have,
f(x) = x² + 3x - 10
Now, put f(x) = 0
x² + 3x - 10 = 0
x² + 5x - 2x - 10 = 0
x(x + 5) - 2(x + 5) = 0
(x - 2) (x + 5) = 0
x - 2 = 0 or x + 5 = 0
x = 2 or x = -5
So, the zeros of given polynomial are 2 and -5.