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15 January, 14:49

Simplify this.

4 (b-1) ²-9

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Answers (2)
  1. 15 January, 15:15
    0
    Step-by-step explanation:

    4 (b-1) ²-9

    = 4[ (b - 1) (b - 1) ] - 9

    = 4[b² - b - b + 1] - 9

    = 4 (b² - 2b + 1) - 9

    Opening bracket

    = 4b² - 8b + 4 - 9

    = 4b² - 8b - 5
  2. 15 January, 15:18
    0
    4 (b-1) ²-9 = 4b²-8b-5

    4 (b-1) ²-9 = (2b+1) (2b-5)

    Step-by-step explanation:

    4 (b-1) ²-9 = 4 (b²-2b+1) - 9 = 4b²-8b-5

    another way:

    4 (b-1) ²-9 = [2 (b-1) ]²-3² = (2b+1) (2b-5)
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