exam Maths Puzzle Numerical Ability

2^2x - 12(2^x) + 32 = 0

I know the answers are 2 and 3 but I do not know how to prove it algebraically

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exam Other Question

insert parenthesis to make the following statement true

1+2x3-5=5
Write an equation of the line containing the given point and parallel to the given line. Express your answer in the form of y=mx+b.

(5,6);x+8y=5

The equation of the line is y= _____