Question

Solve each equation by finding all roots x^4-16=0

Answer 1

Add both sides by 16
so you'll have x^4 =16
take the 4th root of both sides and you'll get x=  2

Answer 2

${ x }^{ 4 }-16=0\\ \\ { x }^{ 4 }=16\\ \\ x=\pm \sqrt [ 4 ]{ 16 } \\ \\ \therefore \quad x=\pm 2$