tolong no.20 a penyelesaian..

f(x)=5^x
y=5^x
x=log5 (y)
f invers x=log5 (x)

g(x^2)
=(x^2)^2+3
=x^4+3

f invers(g(x^2)-3)
=log5(x^4+3-3)
=log5(x^4)
=4(log5(x))