SOLUTION: please help solve by any method: a^4-5a^2+4=0

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Question 194763: please help solve by any method:
a^4-5a^2+4=0
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
please help solve by any method:
a^4-5a^2+4=0
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(a^2 - 1)*(a^2 - 4) = 0
a^2 = 1, 4
a = ± 1
a = ± 2