Rationalize the denominator of (sqrt(5)+sqrt(2))/(sqrt(5)-sqrt(2)). The answer can be written as (A+Bsqrt(C))/D, where A, B, C, and D are integers. D is positive and C is not divisible by the square of any prime. If the greatest common divisor of A, B, and D is 1, find A+B+C+D.
the bottom is sqrt5 - sqrt 2
You just have to multiply both the top and the bottom by sqrt5 + sqrt2
That fact that the top is the same is just a coincidence.
I’m confused. Don’t you have to find A+B+C+D?
CPhill: Your final answer should read:
[7 + 2sqrt(10)] / 3
Why did you vote my answer down Hectictar?
Do you think people should be spoon fed all their answers?
Is a good hint worse than no answer at all?
I am not cross, I am just disillusioned with the site in general.
I'm sorry Melody. I did give your answer a point but then took it back off a few seconds later. To be honest, I can't give you a good reason why I did that. I don't really remember what I was thinking, but maybe it was to make yours and CPhill's answer have equal number of points. I don't think that I had a good reason.