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anonymous

  • one year ago

Please help with simple differentiation x^3-x I know the answer is 3x^2-1 but I cant get it Im doing the long simple way, the limit method? Im not sure what its called Please show steps!

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  1. anonymous
    • one year ago
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    |dw:1443490022511:dw| Can you work from there?

  2. anonymous
    • one year ago
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    you mean by taking a limit, not using the power rule right?

  3. anonymous
    • one year ago
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    let me know when you are ready, it is 98% algebra

  4. anonymous
    • one year ago
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    |dw:1443490344921:dw|

  5. anonymous
    • one year ago
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    I got x3−3x2Δx+3xΔx2−Δx3−x−Δx−x3+x

  6. anonymous
    • one year ago
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    and after everything i ended up with \[3x ^{2} +3x \Delta x + \Delta x ^{2}\]

  7. FireKat97
    • one year ago
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    are you taking a limit to 0?

  8. anonymous
    • one year ago
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    limit to 2

  9. anonymous
    • one year ago
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    but I want the derivative before that which is \[3x ^{2}-1\]

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