Question

(a-b)=3and ab=5then a3-b3=

Answer 1

Answer:

72

Step-by-step explanation:

(a−b)  ^3 =a^3  −b^3  −3ab(a-b)  

⇒(3)^3  =a ^3 −b  ^3 −3(5)(3)

⇒27=a  ^3 −b  ^3 −3(5×3)

⇒27=a^3  −b  ^3  − 3(15)

⇒a  ^3 −b  ^3 =27+45

⇒a  ^3 −b  ^3  = 72

Hence, a  ^3 −b  ^3

=.72