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Problem Solving with Quadratics

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Problem Solving Guide:

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Problem A rectangle has length 3 cm longer than its width. Its area is 42cm². Find its width.

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Problem Is it possible to bend a 12cm length of wireto form the shorter sides of a right-angled triangle with area of 20cm²?

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Solve the following problems. The number of diagonals of an n-sided polygon is given by the formula A polygon has 90 diagonals. How many sides does it have? Formula Use the Pythagorean theorem to solve the following problems:

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Solve (page 307)

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