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Question

If one factor of x2 + 7x + 10 is (x + 2) then the other factor is:


A

(x - 5)

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B

(x + 5)

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C

(x + 4)

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D

(x + 3)

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Solution

The correct option is B

(x + 5)


x2 + 7x + 10

= x2 + 5x + 2x + 10

= x(x + 5) + 2(x + 5)

= (x + 2)(x + 5)


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