SOLUTION: The dimension of a rectangle are 6cm x 10cm. A new rectangle is formed by increasing each dimension by the same amount. The area of the new rectangle is 80cm^2 more than the area

Question 1019932: The dimension of a rectangle are 6cm x 10cm. A new rectangle is formed by increasing each dimension by the same amount. The area of the new rectangle is 80cm^2 more than the area of the original rectangle. Find the dimensions of the new rectangle.
This is my solution:
(10x6)+80=(x+10)(x+6)
60+80 =x^2+16x+60
140 = x^2 +16x +60
140-140 =x^2 +16x +60-140
0 =x^2 +16x -80
(x+20)(x-4)
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
New dimensions, each is increased an additional x; the area of the NEW rectangle is (10+2x)(6+2x)=6*10+80.

Solve this equation for x:

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