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Question

Which factor is true of the trinomial: 10x2+3x−1?

A
2x2+5x1
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B
(2x+1)(5x1)
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C
(2x+1)2(5x1)
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D
(2x+1)2
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Solution

The correct option is B (2x+1)(5x1)
10x2+3x1
=10x2+5x2x1 (Rewrite 3x as 5x2x to make grouping and factoring easier.)
=5x(2x+1)1(2x+1)
=(2x+1)(5x1)
Therefore 10x2+3x1=(2x+1)(5x1)

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