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受欢迎的代数 >

completesquare x^2+13x

解答

配方

x^{2} + 13 x

解答

(x + \frac{13}{2})^{2} - \frac{169}{4}

求解步骤

x^{2} + 13 x

将

x^{2} + 13 x

改写为如下形式:

x^{2} + 2 a x + a^{2}

2 a = 13 : a = \frac{13}{2}

加和减

(\frac{13}{2})^{2}

x^{2} + 13 x + (\frac{13}{2})^{2} - (\frac{13}{2})^{2}

x^{2} + 2 a x + a^{2} = (x + a)^{2}

x^{2} + 13 x + (\frac{13}{2})^{2} = (x + \frac{13}{2})^{2}

(x + \frac{13}{2})^{2} - (\frac{13}{2})^{2}

化简

(x + \frac{13}{2})^{2} - \frac{169}{4}

作图

流行的例子

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