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Question

What should be added to 7x25x+1 to get 3x2+4x+7.

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Solution

Let the value y be added to 7x25x+1 to give 3x2+4x+7
y=3x2+4x+7(7x25x+1)
=3x2+4x+77x2+5x1
=4x2+9x+6

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