brigitteg3 brigitteg3

23-05-2020
Mathematics

contestada

How many real roots does the following equation have?
x4 -81 = 0

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salatulmaghrib salatulmaghrib

23-05-2020

x^4-81 =
(x^2-9)(x^2+9) =
(x+3)(x-3)(x^2+9)

There are two real roots (at x=3,-3).

Answer Link

hbrewer72 hbrewer72

23-05-2020

Answer:

Find roots of x4−81=0 by solving for x. x=3,−3

Step-by-step explanation:

Answer Link

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