Question

Using suitable identities evaluate 9.8*10.2

Answer 1

Hlo friend....Cutiepie Here..


Here is ur answer :

9.8 × 10.2

= ( 10 – 0.2) ( 10 + 0.2)

Using identity : ( a + b) ( a - b) = a² - b²

➡️(10)² – (0.2)²

➡️100 – 0.04

➡️99.96


HOPE IT HELPS YOU..

REGARDS
@sunita

Answer 2

$Using \ suitable \ identities \ evaluate \ 9.8 \times 10.2 = 99.96$

Given:

Evaluate $(9.8 \times 10.2)$

Solution:

$(9.8 \times 10.2) = ((10-0.2) \times(10 + 0.2))$

$\Rightarrow((10 - 0.2) \times (10 + 0.2))$

By using the identity given below, we get,

$(a - b) (a + b) = a^{2} - b^{2}$

$\Rightarrow \left(10^{2} - 0.2^{2}\right)$

$\Rightarrow (100 - 0.04)$

$\Rightarrow 9.8 \times 10.2 = 99.96$

Identity means that identity is an "equality" between "functions" that are differently defined and get the value from that functions.