Question

if a+b=-1 THEN what is the value of a3+b3-3ab

Answer 1

Given

( a + b ) = - 1

To find

a^3 + b^3 - 3ab

Solution

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

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

- 1 = a^3 + b^3 - 3ab