Woah! This the part 2!
Try solving this question!
Some prerequisites:
(a-b)^2 = a^2 + b^2 - 2ab
(a+b)^2 = a^2 + b^2 + 2ab
(a+b)^3 = a^3 + b^3 + 3ab (a+b)
(a-b)^3 = a^3 - b^3 - 3ab (a-b)
Accordingly we will use the formula:
(a-b)^3 = a^3 - b^3 - 3ab (a-b)
alright so (a-b) = 9
(9)^3 = a^3 - b^3 - 3ab (9)
729 = a^3 - b^3 - 27ab
27 = a^3 - b^3
Subtracting we get,
702 = -27ab
ab = 702/(-27) = -26 is the answer!
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