Datrys ar gyfer a
a=\sqrt{7}+4\approx 6.645751311
Neilltuo a
a≔\sqrt{7}+4
Rhannu
Copïo i clipfwrdd
a=\frac{1}{2}\left(\left(\sqrt{7}\right)^{2}+2\sqrt{7}+1\right)
Defnyddio'r theorem binomaidd \left(a+b\right)^{2}=a^{2}+2ab+b^{2} i ehangu'r \left(\sqrt{7}+1\right)^{2}.
a=\frac{1}{2}\left(7+2\sqrt{7}+1\right)
Sgwâr \sqrt{7} yw 7.
a=\frac{1}{2}\left(8+2\sqrt{7}\right)
Adio 7 a 1 i gael 8.
a=4+\sqrt{7}
Defnyddio’r briodwedd ddosbarthu i luosi \frac{1}{2} â 8+2\sqrt{7}.
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