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Deepak Bora
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Asked: 2020-07-26T21:56:03+05:30 In:

Find the zeroes of the quadratic polynomial 7y² – 11/3 y – 2/3 and verify the relationship between the zeroes and the coefficients.

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CBSE 10th Class past year question paper

Year 2019

SET 1, Code Number- 30/2/1

Question number – 21 (b)

cbse 10th classncert class 10thprevious year paper
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    1 Answer

    1. Newbie

      p(y) = 7y² – (11/3)y – 2/3

      = 1/3 (21y² – 11y – 2)

      = 1/3 [(7 y 1)(3y – 2)]

      ∴ Zeroes are 2/3, –1/7

      Sum of zeroes =(2/3) – ( 1/7)

      = -2/21

      -b/a = 11/21

      ∴ sum of zeroes = -b/a

      Product of zeroes = (2/3) – ( 1/7)
      = – 2/21
      c/a = – (2/3) (1/7)

      = – 2/21
      ∴ Product =c/a

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