A quadratic equation is written in the form of ax²+bx+c. The correct option is E and F.
What is a quadratic equation?
A quadratic equation is an equation whose leading coefficient is of second degree also the equation has only one unknown while it has 3 unknown numbers. It is written in the form of ax²+bx+c.
The roots of the given quadratic equations are:
[tex]x = \dfrac{-b\pm\sqrt{b^2-4ac}}{2a}\\\\x = \dfrac{-5\pm\sqrt{5^2-4(1)(9)}}{2(1)}\\\\x= \dfrac{-5 \pm \sqrt{25-36}}{2}\\\\x= \dfrac{-5 \pm \sqrt{-11}}{2}\\\\x= \dfrac{-5 -\sqrt{-11}}{2}, \dfrac{-5 +\sqrt{-11}}{2}[/tex]
Hence, the correct option is E and F.
Learn more about Quadratic Equations:
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