Square Root: If x2 = y, we say that the square root of y is x and we write, √y = x.
Thus, √4 = 2, √9 = 3, √196 = 14.
Cube Root: The cube root of a given number x is the number whose cube is x. We denote the cube root of x by 3√x.
Thus, ∛8 = ∛2 x 2 x 2 = 2, ∛343 = ∛7 x 7 x 7 = 7 etc.
Note:
1.√xy = √x X √y 2. √(x/y) = √x / √y = (√x / √y) X (√y / √y) = √xy / y
Question 1
Q1. Find the least square number which is exactly divisible by 10, 12, 15 and 18.
