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Divide the polynomial f(x) = 3x^2 – x^3 – 3x + 5 by the polynomial g(x) = x – 1 – x^2 and verify the division algorithm. - Mathematics

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Question

Divide the polynomial f(x) = 3x2 – x3 – 3x + 5 by the polynomial g(x) = x – 1 – x2 and verify the division algorithm.

Sum
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Solution

                                   x – 2
`-x^2 + x - 1")"overline(-x^3 + 3x^2 - 3x + 5)`
                        –x3  +  x2  –  x
                         (+)  (–)   (+)              
                                 2x2 – 2x + 5
                                 2x2 – 2x + 2
                                 (–)   (+)   (–)     
                                                  3
Thus, quotient = x – 2 and remainder = 3

Then, f(x) = g(x) × q(x) + r(x)

= (–x2 + x – 1)(x – 2) + 3

= –x3 + x2 – x + 2x2 – 2x + 2 + 3

= –x3 + 3x2 – 3x + 5

Hence Verified.

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