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Write the polynomial in ‘x’ whose zeroes are 1, 2 and – 1.

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The given zeroes of polynomials in ‘x’ are : 1, 2 and – 1. 

The factors of the polynomial are : x – 1, x – 2 and x + 1 

The required polynomial is : (x – 1) (x – 2) (x + 1) 

= (x2 – 1) (x – 2) = x3 – 2x2 – x + 2.

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