Question

If a and b are the zeroes of the quadratic polynomial x2-6x+a, find the value of 'a'. If 3a+2b=20

Answer 1

Answer:

Step-by-step explanation:

Polynomial   P(x) = x² - 6 x + a

Given  α and  β are the roots.

     To find a , if 3α + 2β = 20.  ---(1)

From the quadratic expression:

    α + β = 6       ---(2)

    and   α β = a  --- (3)

Multiply equation (2) by 2 and subtract from (1) to get:

    α = 20 -12 = 8

Substitute this value in(2) to get:    

     β = 6-8 = -2   

Substitute these in (3) to get:    a = α β = -16.

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