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受欢迎的代数 >

7x^2+54x-16=0

解答

7 x^{2} + 54 x - 16 = 0

解答

x = \frac{2}{7}, x = - 8

+1

十进制

x = 0.28571 \dots, x = - 8

求解步骤

7 x^{2} + 54 x - 16 = 0

使用求根公式求解

x_{1, 2} = \frac{- 54 \pm 5 4 ^{2} - 4 \cdot 7 ( - 16 )}{2 \cdot 7}

5 4^{2} - 4 \cdot 7 (- 16) = 58

x_{1, 2} = \frac{- 54 \pm 58}{2 \cdot 7}

将解分隔开

x_{1} = \frac{- 54 + 58}{2 \cdot 7}, x_{2} = \frac{- 54 - 58}{2 \cdot 7}

x = \frac{- 54 + 58}{2 \cdot 7} : \frac{2}{7}

x = \frac{- 54 - 58}{2 \cdot 7} : - 8

二次方程组的解是:

x = \frac{2}{7}, x = - 8

作图

流行的例子

6 n^{2} + 40 = 70

n^{2} = - 3 n + 40

7(x^2-4)=4(x^2-5)

7 (x^{2} - 4) = 4 (x^{2} - 5)

completesquare 7j^2-3j=-j+9

co m pl e t es q u a re 7 j^{2} - 3 j = - j + 9

8 x^{2} = 5 x + 3