**Definition of Perfect Square**

- Perfect square is a number that has a rational number as its square root.

**Examples of Perfect Square**

- 49 is a perfect square as 49 = 7
^{2}. - The following are few more examples of perfect squares.

**More about Perfect Square **

- Perfect Square trinomial: Trinomials of the form
*a*^{2}± 2*ab*+*b*^{2}, which can be expressed as squares of binomials are called perfect square trinomials. *x*^{2}+ 4*x +*4 is a perfect square trinomial as it can be written as (*x*+ 2)^{2}.

**Solved Example on Perfect Square**

Find the least positive number that should be subtracted to make 10 a perfect square.

Choices:

A. 1

B. 4

C. 0

D. 3

Correct Answer: A

Solution:

Step 1:10 - 1 = 9

Step 2:9 is a perfect square.

Step 3:So, 1 should be subtracted from 10 to make it a perfect square.

**Related Terms for Perfect Square**

- Rational Number