Question

using the expansion of (a + b) into (a minus b) is equal to a square minus b square find the value of 101 in 99​

Answer 1

Answer:

101 × 99 = 9999

Step-by-step explanation:

We must find,

101 × 99

= (100 + 1)(100 - 1)

Using the identity,

(a + b)(a - b) = a² - b²

= (100 + 1)(100 - 1) = 100² - 1²

= 10000 - 1

= 9999

So,

101 × 99 = 9999

Hope it helped and believing you understood it........All the best