Question

What is the solution set of the equation 3x^5-48x=0

Answer 1

calculator says: 0, 2i, -2i, -2, 2

but i could only find 0 and 2

step by step:

factor out an x so now its x(3x^4-48)=0

x=0

then factor out a 3

3(x^4-16)=0

x^4=16

x=2