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3 years ago

Find all real and complex roots of the equation below x^4-81=0

Mathematics

1 answer:

Pepsi [2]3 years ago

8 0

$x^4-81=0 \\ (x^2-9)(x^2+9)=0\\ (x-3)(x+3)(x^2+9)=0\\ x=3 \vee x=-3 \vee x=3i \vee x=-3i$

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