Question

evaluate using identities. 210 X 190​

Answer 1

Answer:

19900

Step-by-step explanation:

210 * 190

(200 +10)(200-10)

(a+b) (a-b) =a2 - b2

${200}^{2} - { 10 }^{2}$

20000-100

19900

Answer 2

$\huge{\star}{\underline{\boxed{\red{\sf{Answer :}}}}}{\star}$

Given :-

Evaluate using identity 210 × 190

Solution :-

We can write 210 as (200 + 10)

&

190 as (200 - 10)

Now, we can use identity

$\huge{\underline{\boxed{\green{\sf{(a + b)(a - b) = a^2 - b^2}}}}}$

Here a is 200 and b is 10

___________[Put Values]

(200 + 10)(200 - 10)

(200)² - (10)²

40,000 - 100

39,900

$\huge{\underline{\boxed{\blue{\sf{39,900}}}}}$