Question

Evaluate f(3) for the function f(x)= 15x^2 -x+20

Answer 1

`\huge \boxed{f(15) = 152 }`

Explanation:

`f(x) = 15 {x}^(2) - x + 20`

To find f(3) , substitute the value of x that's 3 into f(x). That is for every x in f(x) replace it with 3.

We have

`f(15) = 15( {3})^(2) - 3 + 20 \\ \: \: = 15(9) + 17 \\ = 135 + 17 \: \\ = 152 \: \: \: \: \: \: \: \: \: \:`

We have the final answer as

`f(15) = 152`

Hope this helps you