Question

16. Simplify: (a + 2)(a ^ 2 + a - 1) and find its value for a = (- 1)
Please solve it fast
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Answer 1

Answer:

solution a3+3a2+a-2, 8

Step-by-step explanation:

please mark as brainlist answer

Answer 2

Answer:

1

Step-by-step explanation:

(a + 2)(a² + a - 1)

= a (a² + a - 1) + 2 (a² + a - 1)

= a³ + a² - a + 2a² + 2a - 2

= 3a² - a + a³ - 2

Now substituting the value of a = -1

3 (-1)² - (-1) + (-1)³ - 2

= 3 + 1 - 1 - 2

= 1