Question

The value of (9.1)2– (0.9)2 is

Answer 1

( 9 . 1 ) 2 - ( 0 . 9 ) 2

18.2 - 0.9 × 2

18.2 - 1.8

16.4

Answer 2

Answer:

$= ( {9 . 1})^{2} - ( {0.9})^{2} \\ = (9.1 + 0.9)(9.1 - 0.9) \\ = 10 \times 8.2 \\ = 82$