Question

For all values of x,

f(x) = x/5 + 3
and
g(x) = 10x²+ 5
Work out fg(x).
Give your answer in the form ax2 + b where a and b are integers.​

Answer 1

fg(x)=f(10x²+5)=(10x²+5)/5+3=10x²/5+5/5+5

=2x²+1+5=2x²+6