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Question

Factor completely: 4x3+12x2+8x

A
x(x+2)(x+1))
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B
4x(x2)(x+1))
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C
4x(x+2)(x+1))
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D
4x2(x+2)(x+1))
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Solution

The correct option is C 4x(x+2)(x+1))
4x3+12x2+8x
Take 4x as common,
=4x(x2+3x+2)
=4x(x2+2x+x+2) (replacing 3x into 2x+x to factorise easily)
=4x(x(x+2)+x(x+2))
So, 4x(x+2)(x+1)) is a complete factor.

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