exam Maths Puzzle Numerical Ability

if the sides of a square are decreased by 2cm, the area is decreased by 36cm^2 how would i get the dimensions of the original square?

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exam Other Question
add and express in simplest form

x^2/x+9 + x-72/x+9

Thanks for the help -8=-(x+4) [ditribute negative into the ()]
-8=-x-4
-8+4=-x-4+4 [add 4 on both sides]
-4=x
x=-4