9992−12=999^2-1^2=9992−12= A181880B998000C989880D1818000Answer: B. 998000 Read Explanation: 9992−12=(999+1)(999−1)999^2-1^2=(999+1)(999-1)9992−12=(999+1)(999−1) =1000×998=998000=1000\times998=998000=1000×998=998000 Read more in App
