Question

(a-b)=3 and ab+5 then a³-b³=________​

Answer 1

Step-by-step explanation:

It is given that (a - b) =3 and ab =5. Then,

(a - b) ³ = a³ - b³ -3ab(a-b)

3³ = a³ - b³ - 3(5)(3)

a³ - b³ = 27 + 45

a³ - b ³ = 72