Question

If (a + b) = 8 and ab = 12, find the value of a^3 - b^3
(Hint: (a - b) = (a + b)2 - 4ab]​

Answer 1

Answer:

a3 + b3 = (a + b)3 – 3ab ( a + b)

= (8)3 – 3(15) (8) = 512 – 360 = 152a3 + b3 = (a + b)3 – 3ab ( a + b)

= (8)3 – 3(15) (8) = 512 – 360 = 152