3y^2-15y=0

解

3 y^{2} - 15 y = 0

y = 5, y = 0

解答ステップ

3 y^{2} - 15 y = 0

解くとthe二次式

y_{1, 2} = \frac{- ( - 15 ) \pm ( - 15 ) ^{2} - 4 \cdot 3 \cdot 0}{2 \cdot 3}

(- 15)^{2} - 4 \cdot 3 \cdot 0 = 15

y_{1, 2} = \frac{- ( - 15 ) \pm 15}{2 \cdot 3}

解を分離する

y_{1} = \frac{- ( - 15 ) + 15}{2 \cdot 3}, y_{2} = \frac{- ( - 15 ) - 15}{2 \cdot 3}

y = \frac{- ( - 15 ) + 15}{2 \cdot 3} : 5

y = \frac{- ( - 15 ) - 15}{2 \cdot 3} : 0

二次equationの解:

y = 5, y = 0