Question

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

Answer 1

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 2

Answer:

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

Step-by-step explanation: