Question

Consider the function f(x)=2x^2-4x what is the vaule of f(x) when x=3

Answer 1

Let's begin by listing out the given information:

`\begin{gathered} f\mleft(x\mright)=2x^2-4x \\ x=3 \\ f\mleft(3\mright)=2(3^2)-4(3) \\ f(3)=2(9)-4(3)=18-12 \\ \therefore f(3)=6 \end{gathered}`f(x) = 6 when x = 3