Question

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

Answer 1

The answer is 19

Explanation:

You solve it like an regular equation

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Answer 2

`f(x)=2x^2+1\\\\\text{substitute the value of x to the equation of the function}\\\\f(3)=2\cdot3^2+1=2\cdot9+1=18+1=19`