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人気のある代数 >

-z^2+15-4z=0

解

- z^{2} + 15 - 4 z = 0

解

z = - 2 - 19, z = 19 - 2

+1

十進法表記

z = - 6.35889 \dots, z = 2.35889 \dots

解答ステップ

- z^{2} + 15 - 4 z = 0

標準的な形式で書く

a x^{2} + b x + c = 0

- z^{2} - 4 z + 15 = 0

解くとthe二次式

z_{1, 2} = \frac{- ( - 4 ) \pm ( - 4 ) ^{2} - 4 ( - 1 ) \cdot 15}{2 ( - 1 )}

(- 4)^{2} - 4 (- 1) \cdot 15 = 219

z_{1, 2} = \frac{- ( - 4 ) \pm 2 19}{2 ( - 1 )}

解を分離する

z_{1} = \frac{- ( - 4 ) + 2 19}{2 ( - 1 )}, z_{2} = \frac{- ( - 4 ) - 2 19}{2 ( - 1 )}

z = \frac{- ( - 4 ) + 2 19}{2 ( - 1 )} : - 2 - 19

z = \frac{- ( - 4 ) - 2 19}{2 ( - 1 )} : 19 - 2

二次equationの解:

z = - 2 - 19, z = 19 - 2

グラフ

人気の例

3 \cdot (x + 2)^{2} = 48

solvefor a,m(a)=8a^2+15a-10

so l v e f or a, m (a) = 8 a^{2} + 15 a - 10

x^2+((a+1)/a)x+1=0

x^{2} + (\frac{a + 1}{a}) x + 1 = 0

x^{2} + 8 x - 1920 = 0

solvefor y,y^2=x^5(2a-x)

so l v e f or y, y^{2} = x^{5} (2 a - x)