exam Maths Puzzle Numerical Ability

Show that nC0+nC2+nC4+...=nC1+nC3+...=2^,where ^=n-1.

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exam Other Question

given that f(x) = x2+3 and g(x) = 5x-2
Write down an expression for the following
(1) (F o G)(x)
(2) (F o F) (x)
(3) (G o G) (x)

And evaluate each expression at the point x = 2
5x-10=-7x+1
how do you find the answer
the steps