You probably have heard the question, “What is the square root of four?” You may be asking yourself how many digits are in 4? This is an easy question to answer with the right math tricks. There are many ways to express 4 as its square root, including -2, +2, and even -2.

## 2

In mathematics, the square root of a number is a number that has the same product as its original value. In this case, the square root of 4 is 2; however, there are other non-square numbers that also have a square root. Let’s look at some of them. In general, 2 is the square root of four. It can also be used to calculate percentages. Here’s how:

First, let’s define the term ”. It stands for square root. In mathematics, it’s the number that equals itself when multiplied by another number. This makes finding the square root of 4 simple. In algebra, the square root of a number is called its principal square root. This can be written as ”2 displaystyle sqrt 2” or ”2 / 2.

## -2

When you refer to the number 4 as its square root, you will always use the term “2×2”. In other words, the two numbers are equivalent. Similarly, when you refer to -2 as the square root of 4, you will use “-4 1/2” or -2. Regardless of which you use, the answer is still the square root of 4! Here are some examples of square roots of 4:

First, we will define a square root. In math, a square root is the quotient of two positive and negative numbers. This is different from the square root of an expression. Generally, a positive number would be the answer. The opposite is true for a negative number. In this case, the expression x2 = 4 contains two different square roots. Then, we will explain why -2 is the square root of 4 and the difference between them.

Besides its two perfect squares, the square root of 4 is also a perfect square. A perfect square has a square root equal to a whole number, and an imperfect square does not have a square root of a whole number. The square root of 4 is a square of two, and 9 is a square of three. In contrast, the square root of 3 is 1.732050.

The ancient Greeks understood that the square root of a positive integer is irrational. This is because a square with a side length of 1 is not a perfect square. Therefore, the square root of 2 cannot be expressed as m/n, since m and n must both be integers. This theorem was first stated by Theaetetus in 380 BC, but it is believed that the square root of 2 was discovered by Hippasus or Pythagoreans earlier.

## +2

The square root of 4 is a number whose product equals the original number. Generally, this number is written as +2 and can be represented in any number of ways, including the radical form as -2. However, there is a special case when it comes to decimal numbers: when we want to express +2 in a sexiest way, we need to use the exponent form.

The principal square root of 4 is two. In most places, this number is written as 2×2, since the square root of a number is not negative. Similarly, the square root of 4 can be written as 2×2.