Precalc
posted by Anonymous .
Determine the xintercepts of the polynomial function y=6(x+7)^4 + 5. Round to two decimal places, if necessary.
y=6(x+7)^4 + 5
0=6(x+7)^4 + 5
5=6(x+7)^4
5/6 =(x+7)^4
There are no xintercepts??
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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