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17 December, 16:07

Solve (-2x-1) (9x+2)

Solve and show work

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Answers (1)
  1. 17 December, 16:58
    0
    -0.5 or - 2/9

    Step-by-step explanation:

    (-2x-1) (9x+2)

    open the bracket

    -18x² - 4x - 9x - 2

    -18x²-13x-2

    (18x²+9x) (+4x+2)

    factorise

    9x (2x+1) + 2 (2x+1)

    (9x+2) (2x+1)

    :separate the bracket and equate to 0

    9x+2=0

    collect like terms

    9x = - 2

    divide through by 9

    x = - 2/9

    or

    4x = - 2

    divide through by 4

    x = - 2/4

    : x = - 0.5

    answer = - 0.5 or - 2/9
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