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Sedaia [141]
3 years ago
12

Plz help me!!!!!!!!!!!!

Mathematics
1 answer:
Mashutka [201]3 years ago
7 0

Answer:  3, -3, 3i, -3i

<u>Step-by-step explanation:</u>

<u>x^4-81=0\\\\Factor:\\(x^2-9)(x^2+9)=0\\(x-3)(x+3)(x^2+9)=0\\\\\text{Apply the Zero Product Property:}\\x-3=0\qquad x+3=0\qquad x^2+9=0\\\boxed{x=3}\qquad \qquad \boxed{x=-3}\qquad \quad x^2=-9\\.\qquad \qquad \qquad \qquad \qquad \qquad x=\sqrt{-9}\\.\qquad \qquad \qquad \qquad \qquad \qquad \boxed{x=\pm 3i}</u>

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