Question

Use the function to answer the question.

f (x) = x2 +4
What is the value of x when f (x) = 4?

Answer 1

x = 0

Explanation:

Given f(x) = x² + 4 and f(x) = 4, then equating

x² + 4 = 4 ( subtract 4 from both sides )

x² = 0 , thus

x = 0

Answer 2

Answer:f(4)= 12

Explanation:

Treat f(x) as y, y=2x + 4, y=12