what should be added to 7x² - 5x + 1 to get -3x² + 4x + 7?
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let the added no. be k
so..
7x^2-5x+1 + K = -3x^2+4x+7
Taking all variables at the same side....
K= (-3x^2+4x+7) - (7x^2 -5x +1)
By doing further calculation...
k = -10x^2+9x+6
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