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3 June, 02:29

Robin thinks that 4x+5x2 is the same as 9x3. Which statement shows that it is NOT the same?

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  1. 3 June, 05:08
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    You can substitute numbers in for x to prove it is not true:

    4x+5x² and 9x³

    Using 3 for x,

    4 (3) + 5 (3²) and 9 (3³)

    12+5 (9) and 9 (27)

    12+45 and 243

    57 and 243

    These are obviously not the same.

    Algebraically speaking, they do not go together because x³ is multiplying; we did not multiply x² and x, we added them.
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