Answer:
f(x) = 3x² + 1
Step-by-step explanation:
In this question, we need to find what equations equals to 13 when we plug in 2 to x.
Solve the equations to find which one is true:
f(2) = 2² + 8
= 4 + 8
= 12
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f(2) = 3(2)² + 1
= 3(4) + 1
= 12 + 1
= 13
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f(2) = 2(2)³ + 5
= 2(8) + 5
= 16 + 5
= 21
---------------
f(2) = 2² + 2
= 4 + 2
= 6
You will see that the 2nd equation, f(x) = 3x² + 1, is the only one that equals to 13, which makes it correct.
