Match the following with I, II, III If x2−x+3x3−1=A(x−1)+Bx+C(x2+x+1) then I) A= a) 0 II) B= b) 1 III) C= c) -2
A
a, b, c
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B
b, a, c
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C
b, c, a
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D
a, c,b
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Solution
The correct option is B b, a, c x2−x+3x3−1=A(x2+x+1)+(Bx+C)(x−1)(x−1)(x2+x+1) equating the co-efficients we get A+B=1 A−B+C=−1 A−C=3 Solving we get A=1;B=0;C=−2 So, A≡b;B≡a;C≡c b,a,c