Q: What do you call nonnegative square roots?

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The principal square root.

Perfect Square

The symbol used to indicate a nonnegative square root.

The absolute value of a number is always nonnegative.

square inches do not have square roots only number have square roots.

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The principal square root.

The unique nonnegative square root of a nonnegative real number. For example, the principal square root of 9 is 3, although both -3 and 3 are square roots of 9.

Square roots of negative numbers ARE possible. I guess you haven't been introduced to "imaginary numbers" and the letter "i".

There are no explicit symbols. The non-negative square toot is called the principal square root.

Yes.

Every positive real number has two square roots: one negative and one positive. As a result, the square root mapping is one-to-many and so is not a mathematical function. One way to make it a function is to restrict the range to non-negative real numbers. These are the non-negative square roots.

a perfect square

Perfect Square

The square root.

The symbol used to indicate a nonnegative square root.

The square root

Are you talking about negative powers.