Question

F(x) = -2² – 3x + 3
Find f (7)

Answer 1

`f(7) = -22 \\`

Explanation:

Whenever there is a question asking to find something like f(7), it is asking you to substitute the number within those parentheses for the matching variable within the function.

To find f(7), first substitute 7 for all the x's within the function. Then, following PEMDAS, simplify like how you normally would. Multiply out
`-2^2`, then multiply 3 by 7, then add all the numbers together.

`\\f(7) = -2^2-3(7)+3\\f(7) = -4 - 21 + 3\\f(7) = -25 + 3\\f(7) = -22`

Thus,
`f(7) = -22 \\`.