Question

please help with this problem I have a test in a few minutes which be about this kind of topic but I don't Understand

Answer 1

Evaluating a function

We want to find f(2) for the following function

f(x) = 2x² + 3x

This means that we want to find the value of f(x) when x = 2. So, we replace all the x by 2:

f(x) = 2x² + 3x

f(2) = 2(2)² + 3 · 2

Since 2² = 4 and 3 · 2 = 6 then

f(2) = 2(2)² + 3 · 2

f(2) = 2 · 4 + 6

f(2) = 8 + 6

f(2) = 14

Answer: f(2) = 14