Datrys 2{left(-sqrt{2}-1right)}^2-2

$$2 { \left(- \sqrt{ 2 } -1 \right) }^{ 2 } -2$$

Enrhifo

$$4\left(\sqrt{2}+1\right)\approx 9.656854249$$

Camau Ateb

Defnyddio'r theorem binomaidd \left(a-b\right)^{2}=a^{2}-2ab+b^{2} i ehangu'r \left(-\sqrt{2}-1\right)^{2}.

$$2\left(\left(-\sqrt{2}\right)^{2}-2\left(-\sqrt{2}\right)+1\right)-2$$

Cyfrifo -\sqrt{2} i bŵer 2 a chael \left(\sqrt{2}\right)^{2}.

$$2\left(\left(\sqrt{2}\right)^{2}-2\left(-\sqrt{2}\right)+1\right)-2$$

Lluosi -2 a -1 i gael 2.

$$2\left(\left(\sqrt{2}\right)^{2}+2\sqrt{2}+1\right)-2$$

Defnyddio’r briodwedd ddosbarthu i luosi 2 â \left(\sqrt{2}\right)^{2}+2\sqrt{2}+1.

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

Sgwâr \sqrt{2} yw 2.

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

Lluosi 2 a 2 i gael 4.

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

Adio 4 a 2 i gael 6.

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

Tynnu 2 o 6 i gael 4.

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

Ehangu

$$4 \sqrt{2} + 4 = 9.656854249$$

Camau Ateb

Defnyddio'r theorem binomaidd \left(a-b\right)^{2}=a^{2}-2ab+b^{2} i ehangu'r \left(-\sqrt{2}-1\right)^{2}.

$$2\left(\left(-\sqrt{2}\right)^{2}-2\left(-\sqrt{2}\right)+1\right)-2$$

Cyfrifo -\sqrt{2} i bŵer 2 a chael \left(\sqrt{2}\right)^{2}.

$$2\left(\left(\sqrt{2}\right)^{2}-2\left(-\sqrt{2}\right)+1\right)-2$$

Lluosi -2 a -1 i gael 2.

$$2\left(\left(\sqrt{2}\right)^{2}+2\sqrt{2}+1\right)-2$$

Defnyddio’r briodwedd ddosbarthu i luosi 2 â \left(\sqrt{2}\right)^{2}+2\sqrt{2}+1.

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

Sgwâr \sqrt{2} yw 2.

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

Lluosi 2 a 2 i gael 4.

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

Adio 4 a 2 i gael 6.

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

Tynnu 2 o 6 i gael 4.

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