Correct Answer: Option D

Explanation

The general quadratic equation
x² - (sum of roots) x + (product of root) = 0
Comparing with the given equation
2x² +3x² - 9 = 0; \(x^2 + \frac{3}{2}x - \frac{9}{2} = 0\\
Sum \hspace{1mm} of \hspace{1mm}roots = -\frac{3}{2}\)

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