Challenge 237: Elegant Evaluation
Here's a problem that you could solve in just five or six lines of working - or a lot more! See if you can come up with an elegant solution.
It is known that x3 = 1 – x .
What is the exact value of x4 – x + x-1 ?
Here's a problem that you could solve in just five or six lines of working - or a lot more! See if you can come up with an elegant solution.
It is known that x3 = 1 – x .
What is the exact value of x4 – x + x-1 ?