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6. Factorization of Polynomials
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Q4 of 96 Page 7

If x = -1/2 is a zero of the polynomial p (x) = 8x3 - ax2 - x + 2, find the value of a.

We have,


p (x) = 8x3 - ax2 - x + 2


 


Put x = -1/2


 


p (-1/2) = 8 (-1/2)2 – a (-1/2)2 – (-1/2) + 2


 


= 8 * – a * + + 2


 


= -1 - + + 2


 


= -


 


Given that,


 


x = -1/2 is a root of p (x)


 


p (-1/2) = 0


 


Therefore,


 


- = 0


 


=


 


2a = 12


 


a = 12/2 = 6


 

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2

Verify whether the indicated numbers are zeros of the polynomials corresponding to them in the following cases:

(i) f(x) = 3x+1; x =


(ii) f(x) = x2-1; x = 1, -1


(iii) g(x) = 3x2-2; x = , -


(iv) p(x) = x3-6x2+11x-6, x = 1,2,3


(v) f(x) = 5x-π, x=


(vi) f(x) = x2, x=0


(vii) f(x) =1x+m, x=


(viii) f(x) = 2x+1, x =

3

If x = 2 is a root of the polynomial f (x)= 2x2-3x+7a, find the value of a.

5

If x = 0 and x = -1 are the roots of the polynomial f (x) = 2x3-3x2+ax+b, find the value of a and b.

6

Find the integral roots of the polynomial f(x) = x3+6x2+11x+6.

Questions · 96
6. Factorization of Polynomials
1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 1 2 3 4 5 6 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
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