Datrys ar gyfer a
a=-\frac{2}{3}\approx -0.666666667
Rhannu
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4^{-3a}=16
Defnyddio rheolau esbonyddion a logarithmau i ddatrys yr hafaliad.
\log(4^{-3a})=\log(16)
Cymryd logarithm dwy ochr yr hafaliad.
-3a\log(4)=\log(16)
Logarithm rhif wedi’i godi i bŵer yw’r pŵer wedi’i lluosi â logarithm y rhif.
-3a=\frac{\log(16)}{\log(4)}
Rhannu’r ddwy ochr â \log(4).
-3a=\log_{4}\left(16\right)
Gyda’r fformiwla newid-sail \frac{\log(a)}{\log(b)}=\log_{b}\left(a\right).
a=\frac{2}{-3}
Rhannu’r ddwy ochr â -3.
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