book Maths Puzzle Numerical Ability

If someone could please help me with the following problem that would be great.
f(x)=2x^2-3x+7 g(x)=3x+5
19.f(g(x))

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book Other Question

Molly is 4 years younger then Heidi. In 3 years, Heidi will be twice as old as Molly. How old are they now? I really need your help on this factoring....seems like there is no answer:
36x^2 - 18x + 9 = 0.

Thank you....

Ray