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8 January, 18:42

Choose the correct simplification of (2x3 + x2 - 4x) - (9x3 - 3x2).

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  1. 8 January, 21:42
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    You start off by multiplying the second bracket by - 1 to get rid of the bracket.

    So,

    (2x3 + x2 - 4x) - 9x3 + 3x2 =

    2x3 + x2 - 4x - 9x3 + 3x2 =

    (2x3 - 9x3) + (x2 + 3x2) - 4x =

    -7x3 + 4x2 - 4x
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