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受欢迎的代数 >

log_{x+4}(25-x^2)=0

解答

lo g_{x + 4} (25 - x^{2}) = 0

解答

x = 26

+1

十进制

x = 4.89897 \dots

求解步骤

lo g_{x + 4} (25 - x^{2}) = 0

使用对数运算法则

\frac{ln ( 25 - x ^{2} )}{ln ( x + 4 )} = 0

\frac{f ( x )}{g ( x )} = 0 \Rightarrow f (x) = 0

ln (25 - x^{2}) = 0

使用对数运算法则

25 - x^{2} = 1

解

25 - x^{2} = 1 : x = 26, x = - 26

x = 26, x = - 26

验证解:

x = 26

真

, x = - 26

假

解是

x = 26

作图

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