Question

Решите квадратное уравнение $15x^{2}$+2x-6=0

Answer 1

$15x^2+2x-6=0 \\ D=4-4*15*(-6)=4+360=364 \\ \\ x_{1}= \frac{-2+2 \sqrt{91} }{30} = \frac{2(-1+\sqrt{91})}{30} = \frac{\sqrt{91}-1}{15} \\ \\ x_{2}=\frac{-2-2 \sqrt{91}}{30}=\frac{2(-1-\sqrt{91})}{30}=\frac{-1-\sqrt{91}}{15}$