akhroor121 akhroor121

13-09-2020
Mathematics

contestada

if a+b= -1 then the value of a^3+b^3 - 3ab= ?

Respuesta :

Hrishii Hrishii

13-09-2020

Answer:

-1

Step-by-step explanation:

[tex](a + b)^{3} = {a}^{3} + {b}^{3} + 3ab(a + b) \\ ( - 1)^{3} = {a}^{3} + {b}^{3} + 3ab( - 1) \\ - 1 = {a}^{3} + {b}^{3} - 3ab\\ \\ \huge \red{ \boxed{{a}^{3} + {b}^{3} - 3ab = - 1}}[/tex]

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