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

#1 Here is the question from the book:
Draw the graph y=x² for -4 < x <4, taking 1cm to represent 1 unit on each axis. Use your graph to find: (a) square root of 6.2 (b) (-3.6)
(6x^3+23x^2+27x) divided by (2x+3)