Datrys ar gyfer f_1
f_{1}=-\log_{10}\left(2\right)\left(7-2x^{2}\right)
Datrys ar gyfer x
x=\frac{\sqrt{2\log_{2}\left(5\right)f_{1}+2f_{1}+14}}{2}
x=-\frac{\sqrt{2\log_{2}\left(5\right)f_{1}+2f_{1}+14}}{2}\text{, }f_{1}\geq -\frac{7\ln(2)}{\ln(10)}
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