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人気のある代数 >

4r^2-5r-5=3r

解

4 r^{2} - 5 r - 5 = 3 r

解

r = \frac{5}{2}, r = - \frac{1}{2}

+1

十進法表記

r = 2.5, r = - 0.5

解答ステップ

4 r^{2} - 5 r - 5 = 3 r

3 r

を左側に移動します

4 r^{2} - 8 r - 5 = 0

解くとthe二次式

r_{1, 2} = \frac{- ( - 8 ) \pm ( - 8 ) ^{2} - 4 \cdot 4 ( - 5 )}{2 \cdot 4}

(- 8)^{2} - 4 \cdot 4 (- 5) = 12

r_{1, 2} = \frac{- ( - 8 ) \pm 12}{2 \cdot 4}

解を分離する

r_{1} = \frac{- ( - 8 ) + 12}{2 \cdot 4}, r_{2} = \frac{- ( - 8 ) - 12}{2 \cdot 4}

r = \frac{- ( - 8 ) + 12}{2 \cdot 4} : \frac{5}{2}

r = \frac{- ( - 8 ) - 12}{2 \cdot 4} : - \frac{1}{2}

二次equationの解:

r = \frac{5}{2}, r = - \frac{1}{2}

グラフ

人気の例

2 x^{2} + 7 x - 7 = 2

solvefor x,x^2+y^2+z^2=z

so l v e f or x, x^{2} + y^{2} + z^{2} = z

solvefor x,x^2-y^2=a^2

so l v e f or x, x^{2} - y^{2} = a^{2}

- 12 x^{2} + 11 x - 2 = 0

solvefor x,-x^2+y^2-z^2=1

so l v e f or x, - x^{2} + y^{2} - z^{2} = 1