Question

For all values of x,
f(x) = x/5 +3
and
g(x) = 10x squared+ 5
Work out fg(x).
Give your answer in the form ax2 + b where a and b are integers.
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Answer 1

Answer:

In fg(x) we have to substitute g(x) for x

f(x)=x/5+3

which can be written as

f(x)=(x+15)/3

fg(x)=(10x²+5+15)/5

=5(2x²+4)/5

=2x²+4