The covariation may be written in terms of the quadratic variation by the polarization identity: [,] = ([+] [] []). Notation: the quadratic variation is also notated as or , . See more

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Quadratic equation formula is given by $$x = \frac{{ – b \pm \sqrt {{b^2} – 4ac} }}{{2a}}$$ $$x = \frac{{ – ( – 8) \pm \sqrt {{{( – 8)}^2} – 4 \times 2 \times ( – 24)} }}{{2 \times 2}} = \frac{{8 \pm \sqrt {64 + 192} }}{4}$$