j0azzap1ershmilia j0azzap1ershmilia

24-11-2016
Mathematics

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

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Greenleafable Greenleafable

25-11-2016

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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