exam Maths Puzzle Numerical Ability

I need to factor completly

a^2-4a+4
and
2x^2y-32y

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exam Other Question

15m+4-9m= -32 What Is M?? How do you identify the smallest subset of the real numbers that contains any given number? How would you apply that for the number e? We don't have a textbook, so I can't refer