Question

please tell the answer to this question.

Answer 1

Answer:

-21

Step-by-step explanation:

   b(b² + b - 7) - 5 (-) (3b² -8)

=  b³ + b² - 7b - 5 - 3b² + 8

= b³ -2b² - 7b + 8 - 5

= b(b² -2b -7) + 3

When b = -3,

= -3((-3)² - 2(-3) - 7) + 3

= -3(9 + 6 - 7) + 3

= -3(8) + 3

= -24 + 3

= -21