Løs 1/4(x+1)(x-1)(x-1)(x+1)+x^2=1/4(x^2+1)(x^2+1)

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

Løs for x (complex solution)

$$x\in \mathrm{C}$$

Løsningsvejledning

Multiplicer x+1 og x+1 for at få \left(x+1\right)^{2}.

$$\frac{1}{4}\left(x+1\right)^{2}\left(x-1\right)\left(x-1\right)+x^{2}=\frac{1}{4}\left(x^{2}+1\right)\left(x^{2}+1\right)$$

Multiplicer x-1 og x-1 for at få \left(x-1\right)^{2}.

$$\frac{1}{4}\left(x+1\right)^{2}\left(x-1\right)^{2}+x^{2}=\frac{1}{4}\left(x^{2}+1\right)\left(x^{2}+1\right)$$

Multiplicer x^{2}+1 og x^{2}+1 for at få \left(x^{2}+1\right)^{2}.

$$\frac{1}{4}\left(x+1\right)^{2}\left(x-1\right)^{2}+x^{2}=\frac{1}{4}\left(x^{2}+1\right)^{2}$$

Brug binomialsætningen \left(a+b\right)^{2}=a^{2}+2ab+b^{2} til at udvide \left(x+1\right)^{2}.

$$\frac{1}{4}\left(x^{2}+2x+1\right)\left(x-1\right)^{2}+x^{2}=\frac{1}{4}\left(x^{2}+1\right)^{2}$$

Brug binomialsætningen \left(a-b\right)^{2}=a^{2}-2ab+b^{2} til at udvide \left(x-1\right)^{2}.

$$\frac{1}{4}\left(x^{2}+2x+1\right)\left(x^{2}-2x+1\right)+x^{2}=\frac{1}{4}\left(x^{2}+1\right)^{2}$$

Brug fordelingsegenskaben til at multiplicere \frac{1}{4} med x^{2}+2x+1.

$$\left(\frac{1}{4}x^{2}+\frac{1}{2}x+\frac{1}{4}\right)\left(x^{2}-2x+1\right)+x^{2}=\frac{1}{4}\left(x^{2}+1\right)^{2}$$

Brug fordelingsegenskaben til at multiplicere \frac{1}{4}x^{2}+\frac{1}{2}x+\frac{1}{4} med x^{2}-2x+1, og kombiner ens led.

$$\frac{1}{4}x^{4}-\frac{1}{2}x^{2}+\frac{1}{4}+x^{2}=\frac{1}{4}\left(x^{2}+1\right)^{2}$$

Kombiner -\frac{1}{2}x^{2} og x^{2} for at få \frac{1}{2}x^{2}.

$$\frac{1}{4}x^{4}+\frac{1}{2}x^{2}+\frac{1}{4}=\frac{1}{4}\left(x^{2}+1\right)^{2}$$

Brug binomialsætningen \left(a+b\right)^{2}=a^{2}+2ab+b^{2} til at udvide \left(x^{2}+1\right)^{2}.

$$\frac{1}{4}x^{4}+\frac{1}{2}x^{2}+\frac{1}{4}=\frac{1}{4}\left(\left(x^{2}\right)^{2}+2x^{2}+1\right)$$

For at hæve en potens til en anden potens, skal du gange eksponenterne. Gang 2 og 2 for at få 4.

$$\frac{1}{4}x^{4}+\frac{1}{2}x^{2}+\frac{1}{4}=\frac{1}{4}\left(x^{4}+2x^{2}+1\right)$$

Brug fordelingsegenskaben til at multiplicere \frac{1}{4} med x^{4}+2x^{2}+1.

$$\frac{1}{4}x^{4}+\frac{1}{2}x^{2}+\frac{1}{4}=\frac{1}{4}x^{4}+\frac{1}{2}x^{2}+\frac{1}{4}$$

Subtraher \frac{1}{4}x^{4} fra begge sider.

$$\frac{1}{4}x^{4}+\frac{1}{2}x^{2}+\frac{1}{4}-\frac{1}{4}x^{4}=\frac{1}{2}x^{2}+\frac{1}{4}$$

Kombiner \frac{1}{4}x^{4} og -\frac{1}{4}x^{4} for at få 0.

$$\frac{1}{2}x^{2}+\frac{1}{4}=\frac{1}{2}x^{2}+\frac{1}{4}$$

Subtraher \frac{1}{2}x^{2} fra begge sider.

$$\frac{1}{2}x^{2}+\frac{1}{4}-\frac{1}{2}x^{2}=\frac{1}{4}$$

Kombiner \frac{1}{2}x^{2} og -\frac{1}{2}x^{2} for at få 0.

$$\frac{1}{4}=\frac{1}{4}$$

Sammenlign \frac{1}{4} og \frac{1}{4}.

$$\text{true}$$

Dette er sandt for alle x.

$$x\in \mathrm{C}$$

Løs for x

$$x\in \mathrm{R}$$

Løsningsvejledning

Multiplicer x+1 og x+1 for at få \left(x+1\right)^{2}.

$$\frac{1}{4}\left(x+1\right)^{2}\left(x-1\right)\left(x-1\right)+x^{2}=\frac{1}{4}\left(x^{2}+1\right)\left(x^{2}+1\right)$$

Multiplicer x-1 og x-1 for at få \left(x-1\right)^{2}.

$$\frac{1}{4}\left(x+1\right)^{2}\left(x-1\right)^{2}+x^{2}=\frac{1}{4}\left(x^{2}+1\right)\left(x^{2}+1\right)$$

Multiplicer x^{2}+1 og x^{2}+1 for at få \left(x^{2}+1\right)^{2}.

$$\frac{1}{4}\left(x+1\right)^{2}\left(x-1\right)^{2}+x^{2}=\frac{1}{4}\left(x^{2}+1\right)^{2}$$

Brug binomialsætningen \left(a+b\right)^{2}=a^{2}+2ab+b^{2} til at udvide \left(x+1\right)^{2}.

$$\frac{1}{4}\left(x^{2}+2x+1\right)\left(x-1\right)^{2}+x^{2}=\frac{1}{4}\left(x^{2}+1\right)^{2}$$

Brug binomialsætningen \left(a-b\right)^{2}=a^{2}-2ab+b^{2} til at udvide \left(x-1\right)^{2}.

$$\frac{1}{4}\left(x^{2}+2x+1\right)\left(x^{2}-2x+1\right)+x^{2}=\frac{1}{4}\left(x^{2}+1\right)^{2}$$

Brug fordelingsegenskaben til at multiplicere \frac{1}{4} med x^{2}+2x+1.

$$\left(\frac{1}{4}x^{2}+\frac{1}{2}x+\frac{1}{4}\right)\left(x^{2}-2x+1\right)+x^{2}=\frac{1}{4}\left(x^{2}+1\right)^{2}$$

Brug fordelingsegenskaben til at multiplicere \frac{1}{4}x^{2}+\frac{1}{2}x+\frac{1}{4} med x^{2}-2x+1, og kombiner ens led.

$$\frac{1}{4}x^{4}-\frac{1}{2}x^{2}+\frac{1}{4}+x^{2}=\frac{1}{4}\left(x^{2}+1\right)^{2}$$

Kombiner -\frac{1}{2}x^{2} og x^{2} for at få \frac{1}{2}x^{2}.

$$\frac{1}{4}x^{4}+\frac{1}{2}x^{2}+\frac{1}{4}=\frac{1}{4}\left(x^{2}+1\right)^{2}$$

Brug binomialsætningen \left(a+b\right)^{2}=a^{2}+2ab+b^{2} til at udvide \left(x^{2}+1\right)^{2}.

$$\frac{1}{4}x^{4}+\frac{1}{2}x^{2}+\frac{1}{4}=\frac{1}{4}\left(\left(x^{2}\right)^{2}+2x^{2}+1\right)$$

For at hæve en potens til en anden potens, skal du gange eksponenterne. Gang 2 og 2 for at få 4.

$$\frac{1}{4}x^{4}+\frac{1}{2}x^{2}+\frac{1}{4}=\frac{1}{4}\left(x^{4}+2x^{2}+1\right)$$

Brug fordelingsegenskaben til at multiplicere \frac{1}{4} med x^{4}+2x^{2}+1.

$$\frac{1}{4}x^{4}+\frac{1}{2}x^{2}+\frac{1}{4}=\frac{1}{4}x^{4}+\frac{1}{2}x^{2}+\frac{1}{4}$$

Subtraher \frac{1}{4}x^{4} fra begge sider.

$$\frac{1}{4}x^{4}+\frac{1}{2}x^{2}+\frac{1}{4}-\frac{1}{4}x^{4}=\frac{1}{2}x^{2}+\frac{1}{4}$$

Kombiner \frac{1}{4}x^{4} og -\frac{1}{4}x^{4} for at få 0.

$$\frac{1}{2}x^{2}+\frac{1}{4}=\frac{1}{2}x^{2}+\frac{1}{4}$$

Subtraher \frac{1}{2}x^{2} fra begge sider.

$$\frac{1}{2}x^{2}+\frac{1}{4}-\frac{1}{2}x^{2}=\frac{1}{4}$$

Kombiner \frac{1}{2}x^{2} og -\frac{1}{2}x^{2} for at få 0.

$$\frac{1}{4}=\frac{1}{4}$$

Sammenlign \frac{1}{4} og \frac{1}{4}.

$$\text{true}$$

Dette er sandt for alle x.

$$x\in \mathrm{R}$$