What is $f (3)$ $f(3)$ if $f (x) = - x^{2} + 7$ $f(x)=-x^2+7$ ?

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Answer 1 · 2016-09-26T23:07:49

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

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

$f (3) = - 9 + 7$ $f(3)=-9+7$
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, $f (3) = - 2$ $f(3) = -2$

What is f(3)f(3) if f(x)=−x2+7f(x)=-x^2+7?