Question

which of the following describes the principal root of 20​

Answer 1

Answer:

4.472

Explanation:

√20=√(4×5)

=√4×√5

=2×√5=>2×2.2355=>4.471

Answer 2

Answer:

The square root of 20 is represented as √20=2×√5=>2×2.2355=>4.471

Explanation:

• The unique nonnegative square root of a nonnegative real number is called it's principal root. For example, the principal square root of 100 is 10.

• Every positive number 'n' has two square roots, one is positive ( $+\sqrt{n}$,the positive square root of n ) , and another is negative ( $-\sqrt{n}$, the negative square root of n ).
• The positive square root is referred as the Principal square root and if it is not stated, the square root of a number always refers to the principal square root.

• The square root of 20 is represented as √20, 20 is said to be radicand and √ is the radical sign .
• √20 can be written as 2√5 = 2×√5=2×2.2355=>4.471