SOLUTION: a 3cm width stripe is cut from a square piece of cardboard. the area of the remaining part of the cardboard is 10cmx2 . Find the initial dimensions of square cardboard

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Question 863731: a 3cm width stripe is cut from a square piece of cardboard. the area of the remaining part of the cardboard is 10cmx2 . Find the initial dimensions of square cardboard
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Uncut square, x%5E2 area. Side length is x.

Remaining rectangle, x%28x-3%29 area. This was given a value 10%2Acm%5E2.
x%5E2-3x=10
x%5E2-3x-10=0
%28x%2B2%29%28x-5%29=0

The meaningful solution is highlight%28x=5%29.