Datrys (sqrt{8}-3)(sqrt{2}+2)

$$( \sqrt { 8 } - 3 ) ( \sqrt { 2 } + 2 )$$

Enrhifo

$$\sqrt{2}-2\approx -0.585786438$$

Camau Ateb

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}.

$$\left(2\sqrt{2}-3\right)\left(\sqrt{2}+2\right)$$

Cyfrifwch y briodoledd ddosrannol drwy luosi pob 2\sqrt{2}-3 gan bob \sqrt{2}+2.

$$2\left(\sqrt{2}\right)^{2}+4\sqrt{2}-3\sqrt{2}-6$$

Sgwâr \sqrt{2} yw 2.

$$2\times 2+4\sqrt{2}-3\sqrt{2}-6$$

Lluosi 2 a 2 i gael 4.

$$4+4\sqrt{2}-3\sqrt{2}-6$$

Cyfuno 4\sqrt{2} a -3\sqrt{2} i gael \sqrt{2}.

$$4+\sqrt{2}-6$$

Tynnu 6 o 4 i gael -2.

$$-2+\sqrt{2}$$

Ffactor

$$\sqrt{2} - 2 = -0.585786438$$