2z^2-11z-21
i need help
As function with zeros is 2z^2-11z-21
\(f(z)=2z^2-11z-21=0\)
\(z = {-b \pm \sqrt{b^2-4ac} \over 2a}\)
\(z = {11 \pm \sqrt{121+1684} \over 4}\)
\(z=\frac{11\pm42.485}{4}\)
\(z_1=13.371\\z_2=-7.871\)
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