Question

What are the zeros of f(x) = x2 - 8x+15?

O
A. x= -5 and x = 3
O
B. x= 3 and x = 5
O
c. x= -3 and x = 5
O
O
D. x= -5 and x= -3

Answer 1

B

Explanation:

f(x) = x² - 8x + 15

x² - 8x + 15 = 0

Sum = -8

Product = 15

Factors = -3 , -5

x² - 3x - 5x + (-5)* (-3) = 0

x(x- 3) - 5(x - 3) = 0

(x- 3)(x - 5 )= 0

x - 3 = o and x -5 = 0

x = 3 & x = 5