Square Root of 494

The square root is the inverse of the square of the number. 494 is not a perfect square. The square root of 494 is expressed in both radical and exponential form. In the radical form, it is expressed as √494, whereas (494)^(1/2) in the exponential form. √494 ≈ 22.224, which is an irrational number because it cannot be expressed in the form of p/q, where p and q are integers and q ≠ 0.

The prime factorization method is used for perfect square numbers. However, the prime factorization method is not used for non-perfect square numbers, where long-division and approximation methods are used. Let us now learn the following methods: 

• Prime factorization method 
• Long division method
• Approximation method

The product of prime factors is the prime factorization of a number. Now let us look at how 494 is broken down into its prime factors.

Step 1: Finding the prime factors of 494

Breaking it down, we get 2 x 13 x 19: 2^1 x 13^1 x 19^1.

Step 2: Now we found out the prime factors of 494. The second step is to make pairs of those prime factors. Since 494 is not a perfect square, therefore the digits of the number can’t be grouped in pairs.

Therefore, calculating 494 using prime factorization is impossible.

The long division method is particularly used for non-perfect square numbers. In this method, we should check the closest perfect square number for the given number. Let us now learn how to find the square root using the long division method, step by step.

Step 1: To begin with, we need to group the numbers from right to left. In the case of 494, we need to group it as 94 and 4.

Step 2: Now we need to find n whose square is 4. We can say n is ‘2’ because 2 x 2 is equal to 4. Now the quotient is 2, after subtracting 4-4 the remainder is 0.

Step 3: Now let us bring down 94, which is the new dividend. Add the old divisor with the same number 2 + 2 to get 4, which will be our new divisor.

Step 4: The new divisor will be the sum of the dividend and quotient. Now we get 4n as the new divisor, we need to find the value of n.

Step 5: The next step is finding 4n × n ≤ 94. Let us consider n as 2, now 42 x 2 = 84.

Step 6: Subtract 94 from 84, the difference is 10, and the quotient is 22.

Step 7: Since the dividend is less than the divisor, we need to add a decimal point. Adding the decimal point allows us to add two zeroes to the dividend. Now the new dividend is 1000.

Step 8: Now we need to find the new divisor, which is 224 because 224 x 4 = 896.

Step 9: Subtracting 896 from 1000, we get the result 104.

Step 10: Now the quotient is 22.4.

Step 11: Continue doing these steps until we get two numbers after the decimal point. Suppose if there are no decimal values, continue till the remainder is zero.

So the square root of √494 ≈ 22.22.

The approximation method is another method for finding square roots. It is an easy method to find the square root of a given number. Now let us learn how to find the square root of 494 using the approximation method.

Step 1: Now we have to find the closest perfect squares of √494. The smallest perfect square less than 494 is 484, and the largest perfect square greater than 494 is 529. √494 falls somewhere between 22 and 23.

Step 2: Now we need to apply the formula that is (Given number - smallest perfect square) / (Greater perfect square - smallest perfect square). Going by the formula (494 - 484) ÷ (529-484) = 0.222.

Using the formula, we identified the decimal point of our square root. The next step is adding the value we got initially to the decimal number, which is 22 + 0.222 ≈ 22.222, so the square root of 494 is approximately 22.222.

• Square root: A square root is the inverse of a square. Example: 4^2 = 16, and the inverse of the square is the square root, that is, √16 = 4.
   
• Irrational number: An irrational number is a number that cannot be written in the form of p/q, where q is not equal to zero, and p and q are integers.
   
• Principal square root: A number has both positive and negative square roots. However, it is always the positive square root that has more prominence due to its uses in the real world. That is the reason it is also known as a principal square root.
   
• Prime factorization: Breaking down a number into its basic building blocks, which are prime numbers.
   
• Decimal: If a number has a whole number and a fraction in a single number, then it is called a decimal. For example: 7.86, 8.65, and 9.42 are decimals.