Advertisement Remove all ads

Evaluate the Following Using Identities: (399)2 - Mathematics

Evaluate the following using identities:

(399)2

Advertisement Remove all ads

Solution

In the given problem, we have to evaluate expressions by using identities.

Given `(399)^2`

We can write`(399)^2 " as " (400 - 1)^2`

We shall use the Identity `(x - y)^2 - 2xy + y^2`

Where x = 400, y = 1

By applying in identity we get 

`(400 - 1)^2 = (400)^2 - 2 xx 400 xx 1 + (1)^2`

`= 400 xx 400 - 800 +  1`

= 16000 - 800 + 1

=159201

Hence the value of `(399)^2` is 159201

 

 

  Is there an error in this question or solution?
Advertisement Remove all ads

APPEARS IN

RD Sharma Mathematics for Class 9
Chapter 4 Algebraic Identities
Exercise 4.1 | Q 2.1 | Page 7
Advertisement Remove all ads

Video TutorialsVIEW ALL [1]

Advertisement Remove all ads
Share
Notifications

View all notifications


      Forgot password?
View in app×