Question

f^2(x)=4x+9 f(x)=?

Answer 1

\[\large f^2(x) ~~can~also~ be~ written ~as~~(f(x))^2\]
\[\large (f(x))^2=4x+9\]
take square root of both sides:
\[\large f(x)=\sqrt{4x+9}\]

Answer 2

o i c ...thank u very much

Answer 3

yw...(: