Posted by Anonymous on Friday, December 9, 2011 at 10:27am.
You dropped the negative sign in front of the 6 in line 3 , so ....
-5 = -6(x+7)^4
(x+7)^4 = 5/6
x+7 = ± (5/6)^(1/4) , fourthroot of (5/6)
I get x = appr. ± .955
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