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Question

Which of the following is a factor of x3+4x2+5x+6

A
x3
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B
x+2
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C
x+3
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D
x2
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Solution

The correct option is A x+3
Let, p(x)=x3+4x2+5x+6
put x=3 in p(x)
p(3)=(3)3+4(3)2+5(3)+6
=27+3615+6
=42+42=0
Since, p(3)=0
x+3 is a factor of p(x)
Option C is correct.

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