CBSE 10th Class past year question paper
Year 2019
SET 1, Code Number- 30/2/1
Question number – 21 (b)
Deepak BoraNewbie
Find the zeroes of the quadratic polynomial 7y² – 11/3 y – 2/3 and verify the relationship between the zeroes and the coefficients.
Share
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