Question

Could someone explain this problem to me? ​

Answer 1

Substitute x with the values given. In this case, 3 and -7.

Answer 2

Answer: -19,21

Step-by-step explanation:

$f(x)=-4x-7\\f(3)=-4*3-7\\f(3)=-12-7\\f(3)=-19\\And,\\f(-7)=-4*(-7)-7\\f(-7)=28-7\\f(-7)=21$