book Maths Puzzle Numerical Ability

x2 +4x-12 x 8x2 - 18
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4x-6 5x+30

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book Other Question

I am having problems completing the square x^2-8x=10. Below is the steps that I have taken:

x^2-8x+16=10+16
x^2-8x =26
(x-4)^2=26

This is where I am completely lost. apply the quadratic formula to find the roots of the given function, and then graph the function.

g(x) = x^2 + x + 12