Question

find the value of:
1.81 × 1.81 - 1.81 × 2.19 + 2.19 × 2.19​

Answer 1

Step-by-step explanation:

1.81 x 1.81 - 1.81 x 2.19 + 2.19 x 2.19

= (1.81)2 - (1.81 x 2.19) + (2.19)2

= (1.81)2 - (1.81 x 2.19) + (2.19)2 - (1.81 x 2.19) + (1.81 x 2.19)

= (1.81)2 - (1.81 x 2.19) + (2.19)2 - (1.81 x 2.19)

= (1.81 - 2.19)2 + (2.00 - 0.19)2 + (1.81 x 2.19)

= (0.38)2 + (4 - (0.19)2)

= 0.1444 + (4 - 0.0361)

= 0.1444 + 3.9639

= 4.1083.