Answer:
f(x)= 2 × (x+8)------(1)
f(x)=12---------(2)
Equating (1) and (2)
⇒2×(x+8)=12
⇒Using distributive property of multiplication with respect to Addition
⇒2 x +16=12
⇒2 x+16-16=12 -16-----[Subtracting 16 from both sides]
⇒2 x= -4
Dividing by , 2 ,on both sides
⇒x= -2
Option C: -2
