Find the sum of the roots of the equation 2x2 + 3x - 9 = 0

  • A -18
  • B -6
  • C \(-\frac{9}{2}\)
  • D \(-\frac{3}{2}\)
waec 2004mathematics

The correct answer is D. \(-\frac{3}{2}\)

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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