Question

simplify: 1/9 - 1/x divided by 1/81 - 1/x^2

answers
a)9/x+9
b)x+9/9
c)x+9/9x
d)9x/x+9

Answer 1

D.

Answer 2

can you show me how you worked that? please.

Answer 3

wait

Answer 4

(1/81 - 1/x^2) = (1/9)^2 - (1/x)^2 = (1/9 - 1/x)*(1/9 + 1/x)

Answer 5

1/9 -1/x =(x-9)/9x
1/81 - 1/x^2 =(x^2 -81)/81x^2 =(x-9)(x+9)/81x^2

(x-9)
-----
9x (x-9) 81x^2
------------ = ------- * ----------- = 9x/(x+9) so that is D.
(x-9)(x+9) 9x (x-9)(x+9)
-----------
81x^2

Answer 6

(1/9 - 1/x) / (1/81 - 1/x^2)

Answer 7

yeah like what jhony said lol

Answer 8

thanks you guys!!

Answer 9

good luck

bye

Answer 10

:)