Question

if f(x)=x^2 + 2x then the solution set of equation 3f(x)=f(3x) is ___​

Answer 1

HERE IS UR ANSWER DEAR,

according to given condition ,

3f(x) = f(3x)

is possible only when x = 1

so

apply x = 1 in the problem

f(1) = (1)² + 2(1)

= 1 + 2

= 3