book Maths Puzzle Numerical Ability

how do i solve the eqation

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

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book Other Question

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))
Please help me!
2( square root sign) 75 + square root 3 over 16