$1.87 paypal for one precal problem help

[wong05tsx 10+ year member]

Given:

x +1/x = 5.

Evaluate:

x^3 - 1/x^3 , without solving for x.

Click to read more...

 

[Tiger Bass 5,000+ posts]

Given:
x +1/x = 5.

Evaluate:

x^3 - 1/x^3 , without solving for x.

Read that wrong actually, gimme a sec.

 

[smd4life 5,000+ posts]

honestly...who the hell cares about that shit....i don't know why people think you need to know that....

 

[SeanDub 10+ year member]

Is that (x + 1) / x = 5 or x + (1/x) = 5? Parentheses are your friend....

 

[SeanDub 10+ year member]

honestly...who the hell cares about that shit....i don't know why people think you need to know that....

And what do you do for a living? Teach history or something?

 

[squeak12 10+ year member]

Im going to go with (1/64)-64 bob.

 

[smd4life 5,000+ posts]

And what do you do for a living? Teach history or something?

does that have anything to do with why the problem above is useful?

do you use this in your job?

 

[wong05tsx 10+ year member]

Is that (x + 1) / x = 5 or x + (1/x) = 5? Parentheses are your friend....

it's

Given:

(x) + (1/x) = (5)

Evaluate (x^3) - (1/x^3), without solving for x.

I think I got it though...

Answer = x+1???

might've just saved myself 1.87 //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif

 

[Tiger Bass 5,000+ posts]

honestly...who the hell cares about that shit....i don't know why people think you need to know that....

So I'm guessing you have no idea what calculus is actually used for?

 

[smd4life 5,000+ posts]

So I'm guessing you have no idea what calculus is actually used for?

hell no...

me=clueless on this shit

 

[wong05tsx 10+ year member]

does that have anything to do with why the problem above is useful?
do you use this in your job?

I know this stuff is useless, but it needs to be done to get my degree..

I intern at a structural engineering firm and the only math we use there is basic algebra, the rest is just logic and given formulas in which you just plug numbers in..

doesn't take away the fact that it's a required class for a degree..

 

[squeak12 10+ year member]

K, I totally missed the 1/x^3 but I took the problem in different terms anyways.

 

[Tiger Bass 5,000+ posts]

What does it mean exactly by not solving for x? Can you solve for x in the first equation then apply it to the second equation?

 

[smd4life 5,000+ posts]

I know this stuff is useless, but it needs to be done to get my degree..
I intern at a structural engineering firm and the only math we use there is basic algebra, the rest is just logic and given formulas in which you just plug numbers in..

doesn't take away the fact that it's a required class for a degree..

im not saying your post is useless or anything...just making a point it's looks pretty ridiculous

 

[Acidburn 5,000+ posts]

Given:
x +1/x = 5.

Evaluate:

x^3 - 1/x^3 , without solving for x.

109.98, -109.98

but I solved for X

if it was Evaluate x^3 + 1/x^3, then it would make more sense then it's just x = 110