Question

If f(x) = -x+7, what is f(15)? (I got -8, which was incorrect) Thanks!

Answer 1

Im not sure why you said ur wrong b/c i got the same answer 
f(x) = -15+ 7
f(x) = -8

Answer 2

Answer: $f(15)=-8$

Step-by-step explanation:

The given function : $f(x)-x+7$

To find $f(15)$ , we need to substitute the value of x=15 in the given function ,so that we have

$f(15)=-15+7\\\\\Rightarrow\ f(15)=-8$

Therefore the value of the given function $f(x)-x+7$

at $x=15 \text{ is}-8$ i.e. $f(15)=-8$