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

IF TWO ANGLES OF A TRIANGLE MEASURE 30 AND 70 DEGREES WHAT IS THE NUMBER OF DEGREES OF THE THIRD ANGLE OF THE TRIANGEL? how do i solve the eqation

xsquared + 61x -1422=0
cannot remeber what to do if i cannot factor??/
thank you