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受欢迎的代数 >

(5^2)/(x+4^2)=21

解答

\frac{5 ^{2}}{x + 4 ^{2}} = 21

解答

x = - \frac{311}{21}

+1

十进制

x = - 14.80952 \dots

求解步骤

\frac{5 ^{2}}{x + 4 ^{2}} = 21

化简

\frac{5 ^{2}}{x + 4 ^{2}} : \frac{25}{x + 16}

\frac{25}{x + 16} = 21

在两边乘以

x + 16

25 = 21 (x + 16)

交换两边

21 (x + 16) = 25

两边除以

21

x + 16 = \frac{25}{21}

将

16

到右边

x = - \frac{311}{21}

验证解

找到无定义的点（奇点）:

x = - 16

将不在定义域的点与解相综合:

x = - \frac{311}{21}

作图

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