Question

F (x) = x2 + 4

What is the value of x when f (x) = 42
A. -2
В. 0
C 12
D. 20

Answer 1

f(x)=X^2+4

f(x)=42

42=X^2+4

X^2+4=42

X^2=42-4

X^2=38

X=sqrt(38)=6.16

`√(?)`