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Zenmo

  • one year ago

Help with small arithmetic. (Calculus)

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  1. Zenmo
    • one year ago
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    I understand everything in this problem, but how did the sign changed from a minus sign to plus sign?

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  2. IrishBoy123
    • one year ago
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    Think of it instead as multiplying top and bottom by 1/sqrt(x^2). That should go straight into the radical but for the x terms note that 1/sqrt(x^2) = 1/|x| = -1/x as x<0 Different algebra but same result.

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