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6 May, 12:11

Factor - 7x3 + 21x2 + 3x - 9 by grouping. What is the resulting expression?

(3 - 7x) (x2 - 3)

(7x - 3) (3 + x2)

(3 - 7x2) (x - 3)

(7x2 - 3) (3 + x)

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Answers (1)
  1. 6 May, 14:45
    +2
    Take the first 2 and take out - 7x2. bringing it to (-7x2) (x-3) + (3x-9)

    then take out 3 on the right side.

    -7x^2 (x-3) + 3 (x-3)

    factors to (3-7x2) (x-3)
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