solvefor x,x^2-15x=0

解

x, x^{2} - 15 x = 0

x = 15, x = 0

解答ステップ

x^{2} - 15 x = 0

解くとthe二次式

x_{1, 2} = \frac{- ( - 15 ) \pm ( - 15 ) ^{2} - 4 \cdot 1 \cdot 0}{2 \cdot 1}

(- 15)^{2} - 4 \cdot 1 \cdot 0 = 15

x_{1, 2} = \frac{- ( - 15 ) \pm 15}{2 \cdot 1}

解を分離する

x_{1} = \frac{- ( - 15 ) + 15}{2 \cdot 1}, x_{2} = \frac{- ( - 15 ) - 15}{2 \cdot 1}

x = \frac{- ( - 15 ) + 15}{2 \cdot 1} : 15

x = \frac{- ( - 15 ) - 15}{2 \cdot 1} : 0

二次equationの解:

x = 15, x = 0