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A square has all its edge lengths increased by 3cm This makes a new square with twice the area of the old one What was the area of the old square?
Wiki User
∙ 14y ago
Old side = x
(x + 3)2 = 2x2
x2 + 6x + 9 = 2x2
6x + 9 = x2
x2 - 6x - 9 = 0
x = 7.245
Old area 52.49 sq cm ( new = 10.2452) = 104.96. Near enough!
Wiki User
∙ 14y ago
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