If f(x) = 2x²+1, what is f(x) when x = 3?

Solution:

A function is a relation between a set of inputs which has one output each.

In other words, a function is a relation between inputs where each input is related exactly to one output.

These type of problem can be easily solved by substituting the given value of x in the given function.

Given: f(x) = 2x² + 1

Substitute x = 3 in the given equation

f(3) = 2(3)² + 1

By further calculation

f(3) = 2(9) + 1

So we get,

f(3) = 18 + 1

f(3) = 19

Therefore, f(x) when x = 3 is 19.

If f(x) = 2x² + 1, what is f(x) when x = 3?

Summary:

If f(x) = 2x² + 1, then the value of f(x) when x = 3 is 19.