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Question

Subtract:
x3 + 3x2 − 5x + 4 from 3x3 − x2 + 2x − 4

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Solution

On arranging the terms of the given expressions in the descending powers of x and subtracting column-wise:

3x3-x2+2x-4 x3+3x2-5x+4- - + - 2x3-4x2+7x-8

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