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f(x) = x² + mx + 15
yv = -1
![y_v = \frac{-\Delta}{4a} \\ \\ y_v = \frac{-[m^2 - 4(1)(15)]}{4*1} \\ \\ -1 = \frac{-[m^2-60]}{4} \\ \\ -m^2 + 60 = -4 \\ \\ -m^2 = -64 \\ \\ m^2 = 64 \\ \\ m = \pm~\sqrt{64} \\ \\ m = \pm~8](https://tex.z-dn.net/?f=y_v+%3D++%5Cfrac%7B-%5CDelta%7D%7B4a%7D++%5C%5C++%5C%5C+y_v+%3D++%5Cfrac%7B-%5Bm%5E2+-+4%281%29%2815%29%5D%7D%7B4%2A1%7D++%5C%5C++%5C%5C+-1+%3D++%5Cfrac%7B-%5Bm%5E2-60%5D%7D%7B4%7D++%5C%5C++%5C%5C+-m%5E2+%2B+60+%3D+-4+%5C%5C++%5C%5C+-m%5E2+%3D+-64+%5C%5C++%5C%5C+m%5E2+%3D+64+%5C%5C++%5C%5C+m+%3D+%5Cpm%7E%5Csqrt%7B64%7D+%5C%5C++%5C%5C+m+%3D+%5Cpm%7E8 "y_v = \frac{-\Delta}{4a} \\ \\ y_v = \frac{-[m^2 - 4(1)(15)]}{4*1} \\ \\ -1 = \frac{-[m^2-60]}{4} \\ \\ -m^2 + 60 = -4 \\ \\ -m^2 = -64 \\ \\ m^2 = 64 \\ \\ m = \pm~\sqrt{64} \\ \\ m = \pm~8")
yv = -1
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