Enrhifo
-2\sqrt{7}\approx -5.291502622
Rhannu
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3\sqrt{7}-\sqrt{175}
Ffactora 63=3^{2}\times 7. Ailysgrifennu ail isradd y lluoswm \sqrt{3^{2}\times 7} fel lluoswm ail israddau \sqrt{3^{2}}\sqrt{7}. Cymryd isradd 3^{2}.
3\sqrt{7}-5\sqrt{7}
Ffactora 175=5^{2}\times 7. Ailysgrifennu ail isradd y lluoswm \sqrt{5^{2}\times 7} fel lluoswm ail israddau \sqrt{5^{2}}\sqrt{7}. Cymryd isradd 5^{2}.
-2\sqrt{7}
Cyfuno 3\sqrt{7} a -5\sqrt{7} i gael -2\sqrt{7}.
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