Question

if x^2=a find x?

Answer 1

x=\[\pm \sqrt{a}\]

Answer 2

If a < 0, then there are no solutions. (E.g., a = -1)

If a = 0, then x = 0

If a > 0, then
\[x = \sqrt{a}\]

Answer 3

or \[x = - \sqrt{a}\]

Answer 4

e.g., if a = 4 and x^2 = 4.

Then x = 2 or -2