Datrys ar gyfer b
b=5
Rhannu
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5^{b-2}=125
Defnyddio rheolau esbonyddion a logarithmau i ddatrys yr hafaliad.
\log(5^{b-2})=\log(125)
Cymryd logarithm dwy ochr yr hafaliad.
\left(b-2\right)\log(5)=\log(125)
Logarithm rhif wedi’i godi i bŵer yw’r pŵer wedi’i lluosi â logarithm y rhif.
b-2=\frac{\log(125)}{\log(5)}
Rhannu’r ddwy ochr â \log(5).
b-2=\log_{5}\left(125\right)
Gyda’r fformiwla newid-sail \frac{\log(a)}{\log(b)}=\log_{b}\left(a\right).
b=3-\left(-2\right)
Adio 2 at ddwy ochr yr hafaliad.
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