what number must be added to x³-x²-5 to get 5x³+6x²+12x
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Step-by-step explanation:
5x³+6x²+12x-(x³-x²-5)
=> 5x³+6x²+12x-x³+x²+5
=> 4x³+7x²+12x+5
must be added. .
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