Lös y=(a-4)^x

$$y = ( a - 4 ) ^ { x }$$

Lös ut a (complex solution)

$$a=e^{\frac{Im(x)arg(y)+iRe(x)arg(y)}{\left(Re(x)\right)^{2}+\left(Im(x)\right)^{2}}-\frac{2\pi n_{1}iRe(x)}{\left(Re(x)\right)^{2}+\left(Im(x)\right)^{2}}-\frac{2\pi n_{1}Im(x)}{\left(Re(x)\right)^{2}+\left(Im(x)\right)^{2}}}\left(|y|\right)^{\frac{Re(x)-iIm(x)}{\left(Re(x)\right)^{2}+\left(Im(x)\right)^{2}}}$$

$$n_{1}\in \mathrm{Z}$$

Lös ut x (complex solution)

$$\left\{\begin{matrix}x=\frac{2\pi n_{1}i}{\ln(a-4)}+\log_{a-4}\left(y\right)\text{, }n_{1}\in \mathrm{Z}\text{, }&y\neq 0\text{ and }a\neq 5\text{ and }a\neq 4\\x\in \mathrm{C}\text{, }&\left(a=4\text{ and }y=0\right)\text{ or }\left(a=5\text{ and }y=1\right)\end{matrix}\right,$$

Lös ut a

$$\left\{\begin{matrix}a=y^{\frac{1}{x}}+4\text{, }&\left(y>0\text{ and }x\neq 0\text{ and }y^{\frac{1}{x}}+4>4\right)\text{ or }\left(y>0\text{ and }x\neq 0\text{ and }y^{\frac{1}{x}}+4<4\text{ and }Denominator(x)\text{bmod}2=1\right)\text{ or }\left(y=0\text{ and }x>0\right)\text{ or }\left(Numerator(x)\text{bmod}2=1\text{ and }Denominator(x)\text{bmod}2=1\text{ and }y<0\text{ and }y^{\frac{1}{x}}\neq 0\text{ and }y^{\frac{1}{x}}+4\neq 4\right)\\a=4-y^{\frac{1}{x}}\text{, }&\left(y>0\text{ and }x\neq 0\text{ and }y^{\frac{1}{x}}<0\text{ and }Numerator(x)\text{bmod}2=0\text{ and }4-y^{\frac{1}{x}}>4\right)\text{ or }\left(y>0\text{ and }x\neq 0\text{ and }y^{\frac{1}{x}}<0\text{ and }Numerator(x)\text{bmod}2=0\text{ and }4-y^{\frac{1}{x}}<4\text{ and }Denominator(x)\text{bmod}2=1\right)\text{ or }\left(Numerator(x)\text{bmod}2=0\text{ and }y=0\text{ and }x>0\right)\text{ or }\left(x\neq 0\text{ and }y>0\text{ and }Numerator(x)\text{bmod}2=0\text{ and }Denominator(x)\text{bmod}2=1\text{ and }4-y^{\frac{1}{x}}\neq 4\right)\text{ or }\left(y<0\text{ and }Numerator(x)\text{bmod}2=1\text{ and }Numerator(x)\text{bmod}2=0\text{ and }Denominator(x)\text{bmod}2=1\text{ and }y^{\frac{1}{x}}\neq 0\text{ and }4-y^{\frac{1}{x}}\neq 4\right)\\a\neq 4\text{, }&y=1\text{ and }x=0\end{matrix}\right,$$

Lös ut x

$$\left\{\begin{matrix}x=\log_{a-4}\left(y\right)\text{, }&y>0\text{ and }a\neq 5\text{ and }a>4\\x\in \mathrm{R}\text{, }&\left(a=5\text{ and }y=1\right)\text{ or }\left(a=3\text{ and }y=-1\text{ and }Denominator(x)\text{bmod}2=1\text{ and }Numerator(x)\text{bmod}2=1\right)\\x>0\text{, }&a=4\text{ and }y=0\end{matrix}\right,$$