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人気のある代数 >

2x^2+40x+32=0

解

2 x^{2} + 40 x + 32 = 0

解

x = 2 (21 - 5), x = - 2 (5 + 21)

+1

十進法表記

x = - 0.83484 \dots, x = - 19.16515 \dots

解答ステップ

2 x^{2} + 40 x + 32 = 0

解くとthe二次式

x_{1, 2} = \frac{- 40 \pm 4 0 ^{2} - 4 \cdot 2 \cdot 32}{2 \cdot 2}

4 0^{2} - 4 \cdot 2 \cdot 32 = 821

x_{1, 2} = \frac{- 40 \pm 8 21}{2 \cdot 2}

解を分離する

x_{1} = \frac{- 40 + 8 21}{2 \cdot 2}, x_{2} = \frac{- 40 - 8 21}{2 \cdot 2}

x = \frac{- 40 + 8 21}{2 \cdot 2} : 2 (21 - 5)

x = \frac{- 40 - 8 21}{2 \cdot 2} : - 2 (5 + 21)

二次equationの解:

x = 2 (21 - 5), x = - 2 (5 + 21)

グラフ

人気の例

6 x^{2} - 4 x = - 2

solvefor r,V=pir^2

so l v e f or r, V = π r^{2}

completesquare {(sqrt(3))/2 (p-2)}^2

co m pl e t es q u a re {\frac{3}{2} (p - 2)}^{2}

solvefor x,x^2+y^2+z^2-4x=0

so l v e f or x, x^{2} + y^{2} + z^{2} - 4 x = 0

(x + 4)^{2} = 5