cool factoring!

Algebra Level 3

What is the value of x^3+1/x^3 if x^2-9x+1=0?


The answer is 702.

Renz jimwel Mina by Renz jimwel Mina , 24, Philippines

This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try refreshing the page, (b) enabling javascript if it is disabled on your browser and, finally, (c) loading the non-javascript version of this page . We're sorry about the hassle.

1 solution

Hemang Sarkar
Jul 24, 2014

rewrite the equation as x + (1/x) = 9 and cube both sides.

11 Helpful 0 Interesting 0 Brilliant 0 Confused

did the same and it is for 95 points, can you believe?

Kartik Sharma - 6 years, 9 months ago

But what is the value of x???

Anuj Shikarkhane - 6 years, 10 months ago

Log in to reply

x = 9 ± 77 2 x=\dfrac{9\pm \sqrt{77}}{2} . We don't need it though. :v

Prasun Biswas - 6 years, 6 months ago

no neeed to know it

math man - 6 years, 9 months ago

Nice.... //////

Sanjana Nedunchezian - 6 years, 10 months ago

as easy as that lol

math man - 6 years, 9 months ago

0 pending reports

×

Problem Loading...

Note Loading...

Set Loading...