Question

Select the correct alternative from the following questions : (2 marks each) 1. Expand : (198)³ *​

Answer 1

answer:

7762392

Step-by-step explanation:

(198)3 =(200 – 2)3

(200 – 2)3 =(200)3 – [ 3 ×(200)2 × 2 ] + [ 3 ×(200)×(2)2 ] –(2)3

{ ∵(a – b)3 = a3 – 3a2b + 3ab2 – b3 }

= 8000000 – 240000 + 2400 – 8

= 7762392