exam Maths Puzzle Numerical Ability

How do you solve for each variable:
(x-3)(x-7)=0
b^2+3b-4=0
n^2+n-12=0
5x^2+18x=8
3a^2+4a=2a^2-2a-9

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exam Other Question

what is the sum of the roots of the quadratic equation: ax^2 + bx + c = 0, where a, b, and c are all non-zero real constants 2x + 3y = 1
5x + 3y = 16

Dependant or incinsistant?