Question 1016190
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When the length of each side of a square is increased by 6 cm, its area is increased by 1,320 cm2.

Find the length of a side of the square before the increase.
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Your equation is 

{{{(x+6)^2}}} - {{{x^2}}} = {{{1320}}}.

Open the parentheses, collect the common terms, simplify and solve.
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