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What is the value of v^3 k^3? (1) v k > 0 (2) v k = 6

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Director
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What is the value of v^3 k^3? (1) v k > 0 (2) v k = 6 [#permalink] New post 23 Sep 2004, 02:37
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Q4:
What is the value of v^3 – k^3?
(1) v k > 0
(2) v – k = 6


Have corrected it.

Last edited by saurya_s on 23 Sep 2004, 10:56, edited 1 time in total.
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 [#permalink] New post 23 Sep 2004, 10:58
I have edited it mate. My apologies.
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 [#permalink] New post 23 Sep 2004, 11:54
I would say E.......!!

v^3-k^3 = (v-k)*(v^2+vk+k^2)

Since vk>0 and we do not know an exact value, we cannot determine..
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 [#permalink] New post 23 Sep 2004, 12:54
cbrf3 wrote:
I would say E.......!!

v^3-k^3 = (v-k)*(v^2+vk+k^2)

Since vk>0 and we do not know an exact value, we cannot determine..


i would say E also, but maybe not

if vk>0, then v and k must both be - or both be +, but since you don't know which is bigger

if v-k=6, still doesn't give us help on the second part of the equation about (v*2+vk+k*2)

if you use both to substitute, etc, you can factor down to (2)(k*2 + 6K + 6), but then are stuck with k*2 + 6K + 6, which if you can solve, then you might have an answer for k, which you could plug back into v-k=6, and eventually get v*3-k*3
  [#permalink] 23 Sep 2004, 12:54
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What is the value of v^3 k^3? (1) v k > 0 (2) v k = 6

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