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20 March, 14:49

Factor by grouping.

12x^3-20x^2+3x-5

+3
Answers (2)
  1. 20 March, 14:53
    0
    12x³ - 20x² + 3x - 5

    4x² (3x) - 4x² (5) + 1 (3x) - 1 (5)

    4x² (3x - 5) + 1 (3x - 5)

    (4x² + 1) (3x - 5)
  2. 20 March, 15:17
    0
    First, group them in 2's (2 numbers per group)

    and see which ones have the factors of each other

    you want to group 12x^3 with 3x because 3 is a factor of 12

    then you want to group - 20x^2 and - 5 together becuase 5 is a factor of 20 so

    (12x^3+3x) + (-20x^2-5)

    undistribute

    (3x) (4x^2+1) + (-5) (4x^2+1)

    revese distribute (ab+ac=a (b+c))

    (3x-5) (4x^2+1)
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