book Maths Puzzle Numerical Ability

what is
a^2-9a+14
3x^2+13x+4
3z^2-17z+20
4x^2-12+9

and solve for x 6x^2=63-13x

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book Other Question

Which is the recipirocal of 8/3 times 13/18? 4y-3(y+8)=12 can you please show how an tell how to solve