Question

Given that f(x) = x^2 + 3, work out the value of
a) f(4) b) f(-4)

Answer 1

f(4) = 19

f(-4) = 19

Explanation:

Since f(x) = x²+3, to find f(4), substitute x = 4 into the equation.

f(4) = 4²+3

= 19

To find f(-4), substitute x = -4 into the equation.

f(-4) = (-4)²+3

= 19