Question

using the identity
$(a - b) {}^{2} = (a {}^{2} - 2ab + b {}^{2} )$
evaluate 699

​

Answer 1

Step-by-step explanation:

It should be (699)²...

699 can be written as (700-1)

(699)² = (700 - 1)²

488601 = (700)² + (1)² - 2(700)(1)

488601 = 490000 + 1 -1400

488601 = 490001 -1400

488601 = 488601

L.H.S= R.H.S