Question

If f(x) = 5x2 - 3 and g(x) = x2 - 4x - 8, find (f - g)(x).

O A. (- 9)(x) = 4x2 - 4x - 5
O B. (f- g)(x) = 4x2 + 4x + 5
O C. (f- g)(x) = 2x2 - 11
O D. (1-9)(x) = 6x2 - 4x - 11

Answer 1

The answer is option B.

f(x) = 5x² - 3

g(x) = x² - 4x - 8

(f - g)(x) = 5x² - 3 - ( x² - 4x - 8)

= 5x² - 3 - x² + 4x + 8

= 4x² + 4x + 5 option B

Hope this helps.