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人気のある代数 >

completesquare x^2+7x+30=0

解

x^{2} + 7 x + 30 = 0

解

x = - \frac{7}{2} + i \frac{71}{2}, x = - \frac{7}{2} - i \frac{71}{2}

解答ステップ

x^{2} + 7 x + 30 = 0

30

を右側に移動します

x^{2} + 7 x = - 30

フォームで書き換える

(x + a)^{2} = b

(x + \frac{7}{2})^{2} = - \frac{71}{4}

では, 解は

f (x) = a, - a

解く

x + \frac{7}{2} = - \frac{71}{4} : x = - \frac{7}{2} + i \frac{71}{2}

解く

x + \frac{7}{2} = - - \frac{71}{4} : x = - \frac{7}{2} - i \frac{71}{2}

二次equationの解:

x = - \frac{7}{2} + i \frac{71}{2}, x = - \frac{7}{2} - i \frac{71}{2}

グラフ

人気の例

p^{2} - 37 p = 0

0 = (x + 1) (x - 3)

4 x^{2} + 12 x = 4 x - 9

x^{2} - 16 x + 16 = 0

3 x^{2} - 9 x - 2 = 0