Question

Evaluate: b²-9(b - 1)², if b = 1.1.​

Answer 1

Answer:

-90.68

Step-by-step explanation:

b² - 9(b - 1)²

b² - 9b² - 9²

1.1² - 9×1.1×1.1 - 81

1.21 - 10.89 - 81

-90.68

Answer 2

Answer:

1.12

Step-by-step explanation:

${1.1}^{2} - 9 {(1.1 - 1)}^{2} \\ = 1.21 - 9 {(0.1)}^{2} \\ = 1.21 - 9 {(0.01)}^{2} \\ = 1.21 - 0.09 \\ = 1.12$