SOLUTION: x^4-8x^2-20=0

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Question 373663: x^4-8x^2-20=0
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi,

x^4-8x^2-20=0

(x^2 -10)(x^2 +2)= 0

(x^2 -10)=0

x^2 = 10

x = +-sqrt%2810%29

(x^2 +2 )= 0

x^2 = -2

x = +-sqrt%28-2%29

x = +-isqrt%282%29