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Question

A factor of x2−7x+12 is :

A
x+3
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B
x3
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C
2x+3
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D
x7
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Solution

The correct option is B x3
x27x+12
=x23x4x+12
=(x23x)(4x12)
=x(x3)4(x3)
=(x3)(x4)

(x3) is a factor of x27x+12 .

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