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2z^2-11z-21

Guest Apr 5, 2017
 #1
avatar+7390 
+1

i need help

2z^2-11z-21

 

 

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

 

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

 

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

 

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

 

\(z=\frac{11\pm42.485}{4}\)

 

\(z_1=13.371\\z_2=-7.871\)

 

laugh  !

asinus  Apr 6, 2017

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