Question

If f(x)=x^2-11, for what values of z is f(x) < 25?

a) -6 < x
b) x < 6
c) x ≤ -6 or x ≥ 6
d) -6 < x < 6

Answer 1

D

Explanation:

f(x) < 25

x² - 11 < 25

x² < 36

-6 < x < 6