Consider the following statements : 1. x−2 is a factor of x3−3x2+4x−4 2. x+1 is a factor of 2x3+4x+6 3. x−1 is a factor of x6−x5+x4−x3+x2−x+1 Of these statements
A
1 and 2 are correct
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B
1, 2 and 3 are correct
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C
2 and 3 are correct
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D
1 and 3 are correct
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Solution
The correct option is A 1 and 2 are correct 1. Remainder =23−3×22+4×2−4 =8−12+8−4=0 Hence x−2 is a factor. 2. Remainder=2(−1)3+4(−1)+6 =−2−4+6=0 Hence x+1 is a factor. 3. Ramainder =16−15+15−13+12−1+1=1 Hence x−1 is not a factor. ∴ Statements 1 and 2 are correct.