Datrys +4+-frac{sqrt{4^2-4(2)(1)}}{2(2)}

$$+4+- \frac{ \sqrt{ { 4 }^{ 2 } -4(2)(1) } }{ 2(2) }$$

Enrhifo

$$-\frac{\sqrt{2}}{2}+4\approx 3.292893219$$

Camau Ateb

Cyfrifo 4 i bŵer 2 a chael 16.

$$4-\frac{\sqrt{16-4\times 2\times 1}}{2\times 2}$$

Lluosi 4 a 2 i gael 8.

$$4-\frac{\sqrt{16-8\times 1}}{2\times 2}$$

Lluosi 8 a 1 i gael 8.

$$4-\frac{\sqrt{16-8}}{2\times 2}$$

Tynnu 8 o 16 i gael 8.

$$4-\frac{\sqrt{8}}{2\times 2}$$

Ffactora 8=2^{2}\times 2. Ailysgrifennu ail isradd y lluoswm \sqrt{2^{2}\times 2} fel lluoswm ail israddau \sqrt{2^{2}}\sqrt{2}. Cymryd isradd 2^{2}.

$$4-\frac{2\sqrt{2}}{2\times 2}$$

Lluosi 2 a 2 i gael 4.

$$4-\frac{2\sqrt{2}}{4}$$

Rhannu 2\sqrt{2} â 4 i gael \frac{1}{2}\sqrt{2}.

$$4-\frac{1}{2}\sqrt{2}$$

Ffactor

$$\frac{8 - \sqrt{2}}{2} = 3.2928932188134525$$