Question

A+b=5 and ab=6 then find[ a-b]^3

Answer 1

Answer:

Given a+b = 5 & ab = 6  

(a+b)  ^3  =a^3 +b ^3 +3ab(a+b)

(5) ^3  =a^3 +b^3 +3×6[5]

125=a^3  +b^3 +90

a ^3 + b^3 =35