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Math Help - Mathematical induction, proving inequation

  1. #1
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    Mathematical induction, proving inequation

    We need to prove this with mathematical induction;

    <br />
(1+x)^r \geq 1 + rx<br />

    r is natural number and x \geq -1

    So if I insert r = 1 and x = -1

    I get 0 \geq 0

    so it's true.

    Then I insert r + 1, and I get

    (1+x)^{r+1} \geq 1 + x(r + 1)
    (1+x)^{r+1} \geq 1 + xr + x

    What now? I just insert a value for x?
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