[tex] \sf log (x {}^{2} -y {}^{2} ) \\ \\ \sf log \left((x + y) \cdot(x - y) \right) \\ \\ \sf log(20 \cdot5) \\ \\ \boxed{\boxed{ \sf d) \: log(100) = 2}}[/tex]
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[tex] \sf log (x {}^{2} -y {}^{2} ) \\ \\ \sf log \left((x + y) \cdot(x - y) \right) \\ \\ \sf log(20 \cdot5) \\ \\ \boxed{\boxed{ \sf d) \: log(100) = 2}}[/tex]