Question

f(×)=-3x+7, what is the value of f(1) f(-8)​

Answer 1

Use the substitution method

f(x)= -3x+7

f(1)= -3(1)+7

= -3+7

= -4

f(-8)= -3(8)+7

= -24+7

= -17

Answers :

f(1)= -4 , f(-8)= -17