Compute the square of 20 1 2 by using appropriate identity.

We know that, ( x + y ) 2 = x 2 + 2 x y + y 2 Therefore, ⇒ 20 1 2 = 20 . 5 ⇒ 20 . 5 = 20 + 0 . 5 ⇒ 20 + 0 . 5 2 = ( 20 ) 2 + 2 × 20 × 0 . 5 + 0 . 5 2 ⇒ 20 + 0 . 5 2 = 400 + 20 + 0 . 25 ⇒ 20 + 0 . 5 2 = 420 . 25 Hence, the square of 20 1 2 is 420 . 25 .

E M B I B E

Standard 8 Mathematics Part - 1>Chapter 4 - Identities>Exercise 2

Kerala Board Solutions for Chapter: Identities, Exercise 2: Exercise 2

Author:Kerala Board

Kerala Board Mathematics Solutions for Exercise - Kerala Board Solutions for Chapter: Identities, Exercise 2: Exercise 2

Attempt the free practice questions on Chapter 4: Identities, Exercise 2: Exercise 2 with hints and solutions to strengthen your understanding. Standard 8 Mathematics Part - 1 solutions are prepared by Experienced Embibe Experts.