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Q.

For certain real numbers a, b and c, the polynomial  g(x)=x3+ax2+x+10  has three distinct roots, and each root of g(x) is also a root of the polynomial  f(x)=x4+x3+bx2+100x+c.The value of f(1) is_____

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a

–7007

b

7007

c

4001 

d

-4001 

answer is A.

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Detailed Solution

g (x) = (x – a) (x – b) (x – c)
f (x) = g (x) h (x)
x4+x3+bx2+100x+c=(x3+ax2+x+10)(x+r)       x4+x3+bx2+100x+c(x3+ax2+x+10)(x+r)=0
x3:1(a+r)=0 and x : 100 – (10 + r) = 0
  r = 90, a = – 89 
g(x)=x389x2+x+10
g (1) = 1 + a + 1 + 10 = 1 – 89 + 1 + 10 = –77
h (1) = 1 + r = 1 + 90 = 91
f (1) = g (1) h (1) = –77.91 = 7007

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