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Alpha and beta are zeroes of polynomial x²-6x+ a. Find the value of a, if 3alpha +2beta = 20

Posted by Kiran Yadav 6 years, 11 months ago

CBSE > Class 10 > Mathematics

4 answers

Vinit Pandit????? 6 years, 11 months ago

p(x)=x2-6x+a a=3alpha+2beta=20.....(1) from the quadratic expression alpha+beta=6.....(2) and alpha×beta=a.....(3) multiply eq.. (2)by 2and subtract from(1) a=20-6×2 a=20-12=8alpha substitute this value in (2) beta=6-8=-2 then( -2)is beta and( 8)is alpha then=alpha×beta =8×-2=-16 answer

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. . 6 years, 11 months ago

Find sum of zeroes alpha+beta=-b/a u will get a value then find the value of alp.and beta with the help of given information and then find product of zroz =c/a u will get the value of a

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Kiran Yadav 6 years, 11 months ago

How u solve this explain

1Thank You

. . 6 years, 11 months ago

-16

0Thank You

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