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人気のある代数 >

28x^2-4x=0

解

28 x^{2} - 4 x = 0

解

x = \frac{1}{7}, x = 0

+1

十進法表記

x = 0.14285 \dots, x = 0

解答ステップ

28 x^{2} - 4 x = 0

解くとthe二次式

x_{1, 2} = \frac{- ( - 4 ) \pm ( - 4 ) ^{2} - 4 \cdot 28 \cdot 0}{2 \cdot 28}

(- 4)^{2} - 4 \cdot 28 \cdot 0 = 4

x_{1, 2} = \frac{- ( - 4 ) \pm 4}{2 \cdot 28}

解を分離する

x_{1} = \frac{- ( - 4 ) + 4}{2 \cdot 28}, x_{2} = \frac{- ( - 4 ) - 4}{2 \cdot 28}

x = \frac{- ( - 4 ) + 4}{2 \cdot 28} : \frac{1}{7}

x = \frac{- ( - 4 ) - 4}{2 \cdot 28} : 0

二次equationの解:

x = \frac{1}{7}, x = 0

グラフ

人気の例

y^{2} - 5 = 8 y

solvefor x,3x^2+2y^2=c

so l v e f or x, 3 x^{2} + 2 y^{2} = c

- 12 r^{2} - 2 = - 4 r

0.825x^2+0.15x-0.003621753=0

0.825 x^{2} + 0.15 x - 0.003621753 = 0

solvefor x,f(x+c)=8(x+c)^2+4

so l v e f or x, f (x + c) = 8 (x + c)^{2} + 4