In this section we will discuss squares and square roots.
Square of a number and square numbers
The square of a number is that number raised to the power 2. Thus, if ‘a’ is a number, then the square of a is written as a2 and is given by a2 = a x a. That is, the square of a number is obtained by multiplying it by itself. If a x a = b i.e. a2 = b, then we say that the square of number a is number b or the number b is the square of number a.
For example : 1) 32 = 3 x 3= 9, so we say that the square of 3 is 9;
2) (-4)2 = -4 x -4 = 16, so we say that the square of -4 is 16;
3) (3/5)2 = (3/5) x(3/5) = 9/25 so we say that the square of (3/5) is 9/25;