Question 353608
Hi,
Let x represent the amount each side is increased.
area ofa rectangle is = l*w
.

question states
(12 + x)(5 + x) = 5*12 + 60 = 120

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solve
60 + 17 x + x^2 = 120
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x^2 + 17x - 60 = 0
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factor
(x + 20)(x-3) = 0
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cannot use solution x = -20
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x = 3
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check your answer
15 * 8 = 120