please tell the answer to this question.
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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
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