Question

if a+b =-1/3 then a^3 +b^3-ab=what

Answer 1

(a+b)^3 = a^3 +b^3 +3ab(a+b)

a+b = -1/3

put the value...

(-1/3)^3 = a^3 +b^3 +3ab* (-1/3)

-1/27 = a^3 +b^3 -ab

Answer 2

(a+b)^3=a^3+b^3-ab
(-1/3)^3=a^3+b^3-ab
(-1/27)=a^3+b^3-ab