Mark M. answered 04/24/19
Tutor
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Mathematics Teacher - NCLB Highly Qualified
x2 + 1/x2 = 23
x4 + 1 = 23x2
x4 - 23x2 + 1 = 0
(x2)2 - 23x2 + (23/2)2 = -1 + (23/2)2
(x2 - 23/2)2 = -1 + 529/4
Can you complete and answer?