book Maths Puzzle Numerical Ability

Find the value of x in the equation 2^x+20=15+3^x

The ^ is supose to be a square root sign

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book Other Question

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 Please help me to: write an equation for a line through (2,2), y intercept 10. Thank you.