A2U4 ExamC

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x = ±2√15

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x = \frac{7 \pm \sqrt{(7)^2 - 4 \cdot 9 \cdot (-4)}}{2 \cdot 9}

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w = \frac{-7 \pm \sqrt{33}}{2}

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13 - 3i

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x = \left\{\pm\frac{2}{3}\right\}

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Definition of a quadratic equation

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Quadratic formula

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Standard form of a complex number

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Definition of imaginary unit i

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Completing the square method

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