Question

evaluate 9.9^2 by identity 2​

Answer 1

Answer:

9.9^2 = 99.81

Step-by-step explanation:

9.9^2

= ( 10 - 0.1 )^2

= 10^2 - 2 × 1 × 0.1 + 0.1^2

= 100 - 0.2 + 0.01

= 100.01 - 0.2

= 99.81

THANKS

Answer 2

Answer:

98.01

Step-by-step explanation:

(10-0.1)^2

10^2+0.1^2-2×10×0.1

100+0.01-2.0

98.01