x^2+30x-7000=0

解

x^{2} + 30 x - 7000 = 0

x = 70, x = - 100

解答ステップ

x^{2} + 30 x - 7000 = 0

解くとthe二次式

x_{1, 2} = \frac{- 30 \pm 3 0 ^{2} - 4 \cdot 1 \cdot ( - 7000 )}{2 \cdot 1}

3 0^{2} - 4 \cdot 1 \cdot (- 7000) = 170

x_{1, 2} = \frac{- 30 \pm 170}{2 \cdot 1}

解を分離する

x_{1} = \frac{- 30 + 170}{2 \cdot 1}, x_{2} = \frac{- 30 - 170}{2 \cdot 1}

x = \frac{- 30 + 170}{2 \cdot 1} : 70

x = \frac{- 30 - 170}{2 \cdot 1} : - 100

二次equationの解:

x = 70, x = - 100