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7 December, 22:00

Daniel expanded the expression as shown. Negative 2 (Negative 8 x minus 4 y + three-fourths) = negative 10 x minus 8 y minus 1 and one-fourth What errors did he make? Select three options.

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  1. 7 December, 22:10
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    16x + 8y - 3/2

    Step-by-step explanation:

    The expression can be represented mathematically as follows.

    -2 (-8x - 4y + 3/4) = - 10x - 8y - 1 1/4

    -2 (-8x - 4y + 3/4) = - 10x - 8y - 5/4

    The first way to solve this expression is by opening the bracket by multiplying the outside values by the inner values.

    -2 (-8x - 4y + 3/4)

    Multiply - 2 by all the values in the brackets

    -2 * - 8x = 16x not - 10x

    -2 * - 4y = 8y not - 8y

    -2 * 3/4 = - 6/4 = - 3/2 not - 5/4

    Bringing the value together the expected answer will be 16x + 8y - 3/2 and not - 10x - 8y - 5/4.
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