Question

solve this using identities
​

Answer 1

Answer: 200

Step-by-step explanation:

51² - 49²

=> (51 + 49)(51 - 49)                               [Since (a² - b²) = (a + b)(a - b)]

=> 100 * 2

=> 200

Answer 2

Answer:

we know :

a²-b² = (a+b)(a-b)

so,

51²-49² = (51+49) (51-49)

= 2601 - 2499 + 2499 - 2401

= 2601-2401 = 200

200

we can write it as √200 = 2√50

hope it helps