Datrys frac{-12-sqrt{12^2-4-02*7}}{2-02}

$$\frac{ -12- \sqrt{ { 12 }^{ 2 } -4-02 \cdot 7 } }{ 2-02 }$$

Enrhifo

$$-\sqrt{35}-6\approx -11.916079783$$

Camau Ateb

Cyfrifo 12 i bŵer 2 a chael 144.

$$\frac{-12-\sqrt{144-4-0\times 2\times 7}}{2-0\times 2}$$

Tynnu 4 o 144 i gael 140.

$$\frac{-12-\sqrt{140-0\times 2\times 7}}{2-0\times 2}$$

Lluosi 0 a 2 i gael 0.

$$\frac{-12-\sqrt{140-0\times 7}}{2-0\times 2}$$

Lluosi 0 a 7 i gael 0.

$$\frac{-12-\sqrt{140-0}}{2-0\times 2}$$

Tynnu 0 o 140 i gael 140.

$$\frac{-12-\sqrt{140}}{2-0\times 2}$$

Ffactora 140=2^{2}\times 35. Ailysgrifennu ail isradd y lluoswm \sqrt{2^{2}\times 35} fel lluoswm ail israddau \sqrt{2^{2}}\sqrt{35}. Cymryd isradd 2^{2}.

$$\frac{-12-2\sqrt{35}}{2-0\times 2}$$

Lluosi 0 a 2 i gael 0.

$$\frac{-12-2\sqrt{35}}{2-0}$$

Tynnu 0 o 2 i gael 2.

$$\frac{-12-2\sqrt{35}}{2}$$

Rhannu pob term -12-2\sqrt{35} â 2 i gael -6-\sqrt{35}.

$$-6-\sqrt{35}$$

Ffactor

$$-\sqrt{35}-6$$