solve x^4-21X^2+54=0 step by step

x^4-21X^2+54=0
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x4-21x2+54=(x2-18)(x2-3)=(x-3√2)(x+3√2)(x-√3)(x+√3)=0.

Solution: x=3√2, -3√2, √3 or -√3.

by Top Rated User (1.2m points)

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