What must be added to 12x3-4x2+3x+7 to make the sum x+2x2-3x+2
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let the number which is to be added be a.
so, according to the question,
(12x³ - 4x² + 3x + 7) + a = x + 2x² - 3x + 2
a = x + 2x² - 3x + 2 - 12x³ + 4x² - 3x - 7
a = -12x³ + 6x² - 5x - 5
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