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17 January, 07:32

Which of the binomials below is a factor of this trinomial? 5x2 + 20x + 15

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  1. 17 January, 11:14
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    Factor the following:

    5 x^2 + 20 x + 15

    Factor 5 out of 5 x^2 + 20 x + 15:

    5 (x^2 + 4 x + 3)

    The factors of 3 that sum to 4 are 3 and 1. So, x^2 + 4 x + 3 = (x + 3) (x + 1):

    Answer: 5 (x + 3) (x + 1)
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