SOLUTION: The diagonal of a square piece of glass is 6 inches longer than the length of a side. What is the equation I would use to represent the problem?

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Question 324077: The diagonal of a square piece of glass is 6 inches longer than the length of a side. What is the equation I would use to represent the problem?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
The sides and the diagonal form a right triangle.
Use the Pythagorean theorem.
S%5E2%2BS%5E2=D%5E2
But you also know that,
D=S%2B6
2S%5E2=%28S%2B6%29%5E2
2S%5E2=S%5E2%2B12S%2B36
S%5E2-12S-36=0