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lesya692 [45]
3 years ago
9

What are the types of roots of the equation below?x^4 - 81 = 0​

Mathematics
1 answer:
natali 33 [55]3 years ago
4 0

Answer:

x^4 - 81 = 0  

(x² - 9)(x² + 9) = 0  

Notice that the first of these is itself a difference of two squares:  

(x - 3)(x + 3)(x² + 9) = 0  

So the solutions are x = 3, x = -3, x = 3i, x = -3i

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