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What is the formula to find the value of X if one side of a rectangle is 3x plus 1 and the other side is X and the area is 30?
Wiki User
∙ 14y ago
Area = length x wide = x(3x + 1) = 30
x(3x + 1) = 30
3x2 + x = 30
3x2 + x - 30 = 0
(3x + 10)(x - 3) = 0
3x + 10 = 0 or x - 3 = 0
x = -10/3 = -3 1/3 or x = 3
Wiki User
∙ 14y ago
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