Find the square root of a perfect square

Using this method, first we have to split the given number into prime factors.

Write those prime factors inside the radical sign instead of the given number.

Inside the radical sign, if the same number is repeated twice, take one number out of the radical sign.

Multiply the numbers which have come out from the radical sign

answer: 0

step-by-step explanation: the positive, like 5, + its opposite, like -5 would be 0

5+(-5)=0, or 5-5=0

question 1: step-by-step explanation:

1/4 of 84 = 84÷4= 21