does every positive number have 2 square roots
Every positive number a has two square roots: √a, which is positive, and −√a, which is negative. Together, these two roots are denoted as ± √a (see ± shorthand). Although the principal square root of a positive number is only one of its two square roots, the designation ``the square root'' is often used to refer to the principal square root. For positive a, the principal square root can also be written in exponent notation, as a.
Square root