Question

solve each equation. state the number and type of roots.
PROBLEM:
x^(5)-81x=0
answer pwease....and explanation :D

Answer 1

x(x^2+9)*(x^2-9) = 0

x=0, +/-3

Answer 2

x^5 - 81x = x*(x^4 - 81)
= x*(x^2 + 9)*(x^2-9)
=x*(x^2+9)*(x+3)*(x-3)

so as you can see from the factors, there are 3 real roots and two imaginary roots for a total of 5.

Answer 3

AHHHH thanks you my friend, ur such a good help ! ^_~

Answer 4

np & yw