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Roots squared

Algebra Level 3

$\large 2x^2-3x+9=0$

Given that $x_1$ and $x_2$ are the roots of the equation above. Find $x_1^2+x_2^2$ .

\frac 32

- \frac {27}4

\frac 92

\frac 94

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by Ronald Chén

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