Question

if x2=16, then x=4

Answer 1

oh no!

Answer 2

Its mainly putting u for x

4^2=16

and 16 divided by 16 is 1

Answer 3

if \(x=4\) then \(x^2=16\)
BUT
if \(x^2=16\) then \(x=4\) or \(x=-4\)