how to solve this fourth degree equation

Question:how to solve this fourth degree equation

Posted: Lonely 400 Product: Maple

March 08 2011

how to solve

$-x^8*a^4+48*z^4+48*x^7*a+8*z*x^6*a-1 = 0$

for a

i tried

$solve(-x^8*a^4+48*z^4+48*x^7*a+8*z*x^6*a-1 = 0, a)$

and got

$RootOf(1-48*z^4+(-48*x^5-8*z*x^4)*_Z+_Z^4, label = _L4)/x^2$

thank you

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