1.

if 2a-3b=4 and ab = 3. Find 8a^3 - 27b^3

Answer»

(2a - 3b) = 4

Cubing

(2a - 3b)³ = 4³

8a³ - 27b³ - 3ab ( 2a - 3b) = 64

8a³ - 27b³ - 3 × 3 × 4 = 64

8a³ - 27b³ = 64 + 36 = 100



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