SOLUTION: a rectangle is 2x feet long and x+5 feet widw. the area is 600 square feet. what are the dimensions of the rectangle

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Question 614214: a rectangle is 2x feet long and x+5 feet widw. the area is 600 square feet. what are the dimensions of the rectangle
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
2x(x + 5) = 600

2x^2 + 10x = 600 ___ x^2 + 5x = 300 ___ x^2 + 5x - 300 = 0

factoring ___ (x + 20)(x - 15) = 0

x + 20 = 0 ___ x = -20 ___ negative value not realistic

x - 15 = 0 ___ x = 15