Algebra II

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A rectangle is 5 inches wide and 6 inches long. If each side is increased by x, the area is tripled. What is the value of x?

• Algebra II -

(5+x)(6+x) = 3*30 = 90

30 + 11 x + x^2 = 90

x^2 + 11 x - 60 = 0

(x+15)(x-4) = 0

x = 4
check
9*10 = 3*30 yes

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