4r^2+44r+121=0

解

4 r^{2} + 44 r + 121 = 0

r = - \frac{11}{2}

十進法表記

r = - 5.5

解答ステップ

4 r^{2} + 44 r + 121 = 0

解くとthe二次式

r_{1, 2} = \frac{- 44 \pm 4 4 ^{2} - 4 \cdot 4 \cdot 121}{2 \cdot 4}

4 4^{2} - 4 \cdot 4 \cdot 121 = 0

r_{1, 2} = \frac{- 44 \pm 0}{2 \cdot 4}

r = \frac{- 44}{2 \cdot 4}

\frac{- 44}{2 \cdot 4} = - \frac{11}{2}

r = - \frac{11}{2}

二次equationの解:

r = - \frac{11}{2}