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Question

Factorise: x2+6x+8

A
(x+8)(x+1)
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B
(x+3)(x+5)
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C
(x4)(x2)
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D
(x+4)(x+2)
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Solution

The correct option is B (x+4)(x+2)
We need to find two integers whose product is 8 and sum is 6.
The factors are 4 and 2.

x2+6x+8=x2+4x+2x+8
=x(x+4)+2(x+4)
=(x+4)(x+2)

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