Question

Find the product of (a + b) (a2 - 3ab + 2b2) and verify the result for a= -1 and b= -2

Answer 1

-9

Step-by-step explanation:

a=-1

b=-2

1. -1+(-2)×[(-1×-1)-(3×-1×-2)+(2×-2×-2)]
2. (-1-2)×[1-6+8]
3. -3×[9-6]
4. -3×3
5. 9