voltron21
  • voltron21
evaluate the limit lim X->9 (x-9)/(x^2-81)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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ganeshie8
  • ganeshie8
hint : x^2-81 = x^2-9^2
ganeshie8
  • ganeshie8
hint2 : a^2-b^2 = (a+b)(a-b)
voltron21
  • voltron21
yea i got that far

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ganeshie8
  • ganeshie8
good, apply them
voltron21
  • voltron21
i did and i canceled x-9 from the top and bottom and plugged 9+9 but apparently 18 isnt the answer what am i doing wrong
ganeshie8
  • ganeshie8
u did a simple mistake, let me show u :)
ganeshie8
  • ganeshie8
\(\large\lim_{ x->9} \frac{(x-9)}{(x^2-81)}\)
ganeshie8
  • ganeshie8
\(\large\lim_{ x->9} \frac{(x-9)}{(x+9)(x-9)}\)
ganeshie8
  • ganeshie8
\(\large\lim_{ x->9} \frac{\cancel{(x-9)}}{(x+9)\cancel{(x-9)}}\)
ganeshie8
  • ganeshie8
\(\large\lim_{ x->9} \frac{1}{(x+9)}\)
ganeshie8
  • ganeshie8
now sub, wat do u get ?
voltron21
  • voltron21
oh i get it thanks so much i was about to go insane
ganeshie8
  • ganeshie8
np you're wlcme :)

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