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Factor: 5x^2 - 15x - 20.

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5x2 - 15x - 20 = 5x2 - 20x + 5x - 20

                       = 5x (x -4 ) + 5( x -4)

                      = (x - 4) ( 5x + 5)

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Ravindra Pindel

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