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18 January, 05:47

Select True or False. The expression 3x - 4 (2x - 5) is equivalent to the expression 20 - 5x.

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Answers (2)
  1. 18 January, 08:16
    +1
    True

    Step-by-step explanation:

    Expand - 4 (2x - 5)

    Apply the distributive law

    -4 * 2x - (-4) * 5

    Apply minus plus rules

    -4 * 2x + 4 * 5

    Simplify

    -8x + 20

    3x - 8x + 20 = 20 - 5x

    Add similar elements

    -5x + 20 = 20 - 5x

    Subract 20 from both sides

    -5x + 20 - 20 = 20 - 5x - 20

    Simplify

    -5x = - 5x

    Add 5x to both sides

    -5x + 5x = - 5x + 5x

    Simplify Once more

    0 = 0

    So the answer is true.
  2. 18 January, 08:51
    +1
    TRUE

    Step-by-step explanation:

    3x - 4 (2x-5)

    -4 x 2x = - 8x

    -4 x - 5 = 20

    3x - 8x + 20

    = 20 - 5x
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