Posted by **hmmm** on Monday, April 29, 2013 at 11:28am.

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**, Monday, April 29, 2013 at 11:52am
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**, Monday, April 29, 2013 at 11:56am
@Steve r u sure of ur answer?

- Math!!! can't solve this... -
**Reiny**, Monday, April 29, 2013 at 1:04pm
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**, Monday, April 29, 2013 at 1:55pm
Thanks, Reiny. I used wolfram also :)

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