Datrys ar gyfer x
x=7
Datrys ar gyfer x (complex solution)
x=-\frac{i\pi n_{1}}{\ln(3)}+7
n_{1}\in \mathrm{Z}
Graff
Rhannu
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9^{-x+9}=81
Defnyddio rheolau esbonyddion a logarithmau i ddatrys yr hafaliad.
\log(9^{-x+9})=\log(81)
Cymryd logarithm dwy ochr yr hafaliad.
\left(-x+9\right)\log(9)=\log(81)
Logarithm rhif wedi’i godi i bŵer yw’r pŵer wedi’i lluosi â logarithm y rhif.
-x+9=\frac{\log(81)}{\log(9)}
Rhannu’r ddwy ochr â \log(9).
-x+9=\log_{9}\left(81\right)
Gyda’r fformiwla newid-sail \frac{\log(a)}{\log(b)}=\log_{b}\left(a\right).
-x=2-9
Tynnu 9 o ddwy ochr yr hafaliad.
x=-\frac{7}{-1}
Rhannu’r ddwy ochr â -1.
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