Question

F f(x)=4x^(2)-9, find f(-1)


f(-1)= ?

Answer 1

`f(-1)=-5`

Explanation:

Numeric Value of a Function

Given:

`f(x)=4x^2-9`

It's required to find f(-1).

It can be calculated by substituting the value x=-1 in the function:

`f(-1)=4(-1)^2-9`

Calculating:

`f(-1)=4*1-9`

`f(-1)=4-9`

`\boxed{f(-1)=-5}`