$\alpha$ and $\beta$ are the roots of $x^2+2x+c=0$. If $\alpha^3+\beta^3=4$,then the value of $c$ is

  • A
    -$2$
  • B
    $3$
  • C
    $2$
  • D
    $4$

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$\alpha, \beta, \gamma$ are the roots of the equation $x^3-10 x^2+7 x+8=0$. Match the following and choose the correct answer.
$A. \alpha + \beta + \gamma$$(1) -\frac{43}{4}$
$B. \alpha^2 + \beta^2 + \gamma^2$$(2) -\frac{7}{8}$
$C. \frac{1}{\alpha} + \frac{1}{\beta} + \frac{1}{\gamma}$$(3) 86$
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$(5) 10$

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