3. Let r be a root of x3 - 5x +7 = 0. In Q[r] express - 1- 7r + 2r2 a) 1+r + r2 | as a quadratic polynomial in r. 14r2 + 12r – 35 b) - 2r2 + r

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A: Note: As per our guidelines , we can solve first three subparts . please repost remaining subparts.

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A: Follow the procedure given below.

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A: topic - application of derivatives

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A: NOTE: As per our guidelines, I have solved three parts. If you want the answer of other, kindly post...

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A: Solution is written in below steps.

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A: Solved below

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