Datrys ar gyfer x
x=-1
Datrys ar gyfer x (complex solution)
x=-\frac{2\pi n_{1}i}{\ln(3)}-1
n_{1}\in \mathrm{Z}
Graff
Rhannu
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5\times 3^{-x+1}=45
Defnyddio rheolau esbonyddion a logarithmau i ddatrys yr hafaliad.
3^{-x+1}=9
Rhannu’r ddwy ochr â 5.
\log(3^{-x+1})=\log(9)
Cymryd logarithm dwy ochr yr hafaliad.
\left(-x+1\right)\log(3)=\log(9)
Logarithm rhif wedi’i godi i bŵer yw’r pŵer wedi’i lluosi â logarithm y rhif.
-x+1=\frac{\log(9)}{\log(3)}
Rhannu’r ddwy ochr â \log(3).
-x+1=\log_{3}\left(9\right)
Gyda’r fformiwla newid-sail \frac{\log(a)}{\log(b)}=\log_{b}\left(a\right).
-x=2-1
Tynnu 1 o ddwy ochr yr hafaliad.
x=\frac{1}{-1}
Rhannu’r ddwy ochr â -1.
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