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# i need help

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2z^2-11z-21

Guest Apr 5, 2017
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i need help

2z^2-11z-21

As function with zeros is 2z^2-11z-21

$$f(z)=2z^2-11z-21=0$$

$$z = {-b \pm \sqrt{b^2-4ac} \over 2a}$$

$$z = {11 \pm \sqrt{121+1684} \over 4}$$

$$z=\frac{11\pm42.485}{4}$$

$$z_1=13.371\\z_2=-7.871$$

!

asinus  Apr 6, 2017

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