Question

F(x) = 5x2 – 7(4x + 3). What is the value of f(3)?

Answer 1

Given the function:

`f(x)=5x^2-7(4x+3)`

we can find f(3) by making x = 3 and solving for the term f. In this case, we have the following:

`\begin{gathered} f(3)=5(3)^2-7(4(3)+3) \\ =5(9)-7(12+3)=45-7(15)=45-105=-60 \\ \Rightarrow f(3)=-60 \end{gathered}`

therefore, f(3) = -60