Solve a quadratic that is not easily factorable by inspection.
\( \text{Solve the quadratic equation: } x^2 + 3x - 18 = 0 \)
Choose one option:
Compute discriminant first, then apply + and - separately.
Apply \(x = \frac{-b \pm \sqrt{b^2-4ac}}{2a}\) to find roots: x=-6,3.
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