<PRE><B>Question 255837</B>
 A rectangle is 6cm long and 5 cm wide. When each dimension is increased by x cm, the area is tripled. Find the value of x. 
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Original area = 6*5  = 30 cm^2
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Equation:
(6+x)(5+x) = 3*30
x^2 + 11x + 30 - 90 = 0
x^2 + 11x - 60 = 0
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(x+15)(x-4) = 0 
Positive solution:
x = 4 cm
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Cheers,
Stan H.</PRE>