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Posted by on Saturday, September 29, 2012 at 6:57pm.

If the limit as x approaches 1 for (f(x) - 7)/(x-1)=8,
evaluate the limit as x approaches 1 for f(x)

  • Math - , Saturday, September 29, 2012 at 7:06pm

    the left is undefined as x >> 1
    but for any other x very close to x = 1
    f(x) - 7 = 8(x-1)
    for example if x = .99
    f(.99) - 7 = 8(.99-1) = 8 (-.01) = - .08
    f(.99) = 7 -.08
    which might give us a hint as to where f(x) was going :)
    in fact it looks to me like
    f(x) - 7 = 8(x-1)
    is similar to
    f(x) = 7 + 8(x-1)
    and as x >>1
    f(1) =7 +8(0) = 7

  • Math - , Saturday, September 29, 2012 at 7:14pm

    Thank you so much!!

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