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Geometry. If the sides of a square are decreased by 2cmm the area is decreased by 36cm^2. What were the dimensions of the original square?:

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The town of sprinfield purchased a Chevrolet, Ford and Toyota for total of $ 66,000. The Ford was $ 2000 more than the Cheverlot and the Toyota was $ 2000 more than the Ford. What is the price of each car?

Kindly help me. Thank you. Explain what the value of the discriminant means to the graph of y = ax2+bx+c=0.
Hint: Chose values of a,b, and c to create a particular discriminant. Then, graph the correspondi