Question

using identities evaluate: (99)2​

Answer 1

Answer:

(99)² = 9801

Step-by-step explanation:

(99)² = (100 - 1)²

= (100)² + (1)² - 2(100)(1)

= 10000 + 1 - 200

= 10000 - 199

= 9801

Answer 2

Answer:

(a-b)2=a2-2ab+b2=(100-1)2=(100)2-2.100.1+(1)2=10000-200+1=10001-200=9801