Question

The number of books read by a mathematician 2 years after he turned 25 is given by the polynomial

function C(x) = 3x2 + 80x. Find the number of books read by him when x = 4 years.

Answer 1

Evaluating a function means to plug the required value, substituting every x occurrence with that value.

So, you have

`f(x)=3x^2+80x \implies f(2) = 3\cdot 2^2+80\cdot 2 = 3\cdot 4 + 160 = 12+160=172`

Answer 2

368

Explanation: