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OpenStudy (anonymous):
Find all solutions to x^4+81=0
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OpenStudy (jchick):
Welcome to OpenStudy!
OpenStudy (jchick):
x = +/- 3 or x^4 - 81 = 0 (x^2 + 9)(x^2 - 9) = 0 (x^2 + 9)(x - 3)(x + 3) = 0 x^2 = -9 x = +/- 3i, +/- 3
OpenStudy (mathstudent55):
I thought the equation was x^4 + 81 = 0, not x^4 - 81 = 0.
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