book Maths Puzzle Numerical Ability

How would you solve (x-12)^2 ?
I need to know how to solve this and show my work too.
(x-12)(x+12)= FOIL it, x^2-12x+12x-144 =
x^2-144

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book Other Question

a^-4b^7c^8d^-3/e^5f^-2g^3 Find the value of x in the equation 2^x+20=15+3^x

The ^ is supose to be a square root sign