If \[\alpha ,\beta \]are the roots of the equation \[{{x}^{2}}+ax+b=0\]then the value of \[{{\alpha }^{3}}+{{\beta }^{3}}\]is equal to [RPET 1989; Pb. CET 1991]

If \[\alpha ,\beta \]are the roots of the equation \[{{x}^{2}}+ax+b=

1.	If \[\alpha ,\beta \]are the roots of the equation \[{{x}^{2}}+ax+b=0\]then the value of \[{{\alpha }^{3}}+{{\beta }^{3}}\]is equal to [RPET 1989; Pb. CET 1991]
A.	\[-({{a}^{3}}+3ab)\]
B.	\[{{a}^{3}}+3ab\]
C.	\[-{{a}^{3}}+3ab\]
D.	\[{{a}^{3}}-3ab\]
Answer» D. \[{{a}^{3}}-3ab\]

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If \[\alpha ,\beta \]are the roots of the equation \[{{x}^{2}}+ax+b=0\]then the value of \[{{\alpha }^{3}}+{{\beta }^{3}}\]is equal to [RPET 1989; Pb. CET 1991]

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