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20 March, 06:24

How many real roots does the following equation have?

x4 - 81 = 0

+2
Answers (2)
  1. 20 March, 06:35
    0
    Find roots of x4-81=0 by solving for x. x=3,-3
  2. 20 March, 06:38
    0
    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).
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