Question

if a+b=-1 then the value of a³+b³-3ab is???​

Answer 1

$<font color=red>$Question

$<font color=purple>$if a+b=-1 then the value of a³+b³-3ab is???

$<font color=red>$

Step-by-step explanation:

$<font color=blue>$(a+b)³-3ab

(-1)³ - 3ab

(-1) -3ab

3ab

$<font color=purple>$Answer

$<font color=green>$ 3ab

Answer 2

Step-by-step explanation:

a³+b³-3ab

(a+b)(a²+b²-ab) -3ab

-1(a²+b²-ab) -3ab

-1{(a+b) ²-3ab}-3ab

-1{1-3ab}-3ab

-1+3ab-3ab

-1 is your answer