SOLUTION: Solve by making a u-substitution. X(to the 4th power)-84x(to the 2nd power)+320=0

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Question 964267: Solve by making a u-substitution. X(to the 4th power)-84x(to the 2nd power)+320=0
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Solve by making a u-substitution. X(to the 4th power)-84x(to the 2nd power)+320=0
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Sub u for x^2
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u^2 - 84u + 320 = 0
Solve for u, then sub back.