Posted by hmmm on .
If the expression (x^2+2x−1)^8 is completely expanded, what is the sum of the coefficients of the terms with even powers of x?

Math!!! can't solve this... 
Steve,
256
Not sure what's the point of using such a high power. Tedious, but doesn't provide any real insight. 
Math!!! can't solve this... 
boy,
@Steve r u sure of ur answer?

Math!!! can't solve this... 
Reiny,
Steve is correct, the sum is 256
I let Wolfram do all the drudgery
http://www.wolframalpha.com/input/?i=expand+%28x%5E2%2B2x−1%29%5E8
Agree with Steve, this question is simply a test of patience. 
Math!!! can't solve this... 
Steve,
Thanks, Reiny. I used wolfram also :)