Question

2.8X2.8X2.8-1.8X1.8X1.8
Q27.Using identity, evaluate
2.8X2.8+2.8x1.8+1.8X1.8
227. Using identity, evaluate 28x20428-10x10x1.​

Answer 1

Answer:

16.12

Step-by-step explanation:

let me take the First question.

2.8X2.8X2.8-1.8X1.8X1.8

= 2.8³ - 1.8³

= (2.8 - 1.8)(2.8²+2.8*1.8+1.8²)

= (1) . [(2.8+1.8)²-2(2.8*1.8) + (2.8*1.8)]

= 4.6² - (2.8*1.8)

= 21.16 - 5.04

= 16.12