9y^2-30y+25=0

解

9 y^{2} - 30 y + 25 = 0

y = \frac{5}{3}

十進法表記

y = 1.66666 \dots

解答ステップ

9 y^{2} - 30 y + 25 = 0

解くとthe二次式

y_{1, 2} = \frac{- ( - 30 ) \pm ( - 30 ) ^{2} - 4 \cdot 9 \cdot 25}{2 \cdot 9}

(- 30)^{2} - 4 \cdot 9 \cdot 25 = 0

y_{1, 2} = \frac{- ( - 30 ) \pm 0}{2 \cdot 9}

y = \frac{- ( - 30 )}{2 \cdot 9}

\frac{- ( - 30 )}{2 \cdot 9} = \frac{5}{3}

y = \frac{5}{3}

二次equationの解:

y = \frac{5}{3}