Question

What is `f(3)` if `f(x)=-x^2+7`?

Answer 1

f(3) just means to substitute 3 in for x. `f(3)=-2`

Explanation:

`f(3) = -(3)^2 + 7`
According to the order of operations, first square the 3, which is 9.

`f(3)=-9+7`
The negative sign in front of the x squared is equivalent to multiplying by negative one.

Add -9 and 7 together, which is -2
So, `f(3) = -2`