Question

Which function has zeros at x = 10 and x = 2? f(x) = x2 – 12x + 20 f(x) = x2 – 20x + 12 f(x) = 5x2 + 40x + 60 f(x) = 5x2 + 60x + 100

Answer 1

First one:

f(x) = x2 – 12x + 20

Explanation:

Factors:

(x - 10)(x - 2)

x² - 10x - 2x + 20

x² - 12x + 20

Answer 2

x^2 -12x+20

Explanation:

If the zeros of the functions are at 10 and 2

(x-10) (x-2)

FOIL

x^2 -2x-10x+20

Combine like terms

x^2 -12x+20