Question

If 2a - 3b = 3 and ab = 2 find the values of 8a³ - 27b³​

Answer 1

8a-27b3

(2a-3b)3=8a3-27b3-18ab(2a-3b)

Formula used (a+b)=a3-bº-3ab(a-b)

(3)3=8a2-27b3-18(2)(3)

27=8a3-27b3-108

27+108=8a3-27b3

135=8a-27b3