Selesaikan (2x^2-1/(x-2)(x+1))^2-8(2x^2-1)+7.(x-1)(x+2)

$$( 2 x ^ { 2 } - \frac { 1 } { ( x - 2 ) ( x + 1 ) } ) ^ { 2 } - 8 ( 2 x ^ { 2 } - 1 ) + 7 . ( x - 1 ) ( x + 2 )$$

Nilaikan

$$\frac{4x^{8}-8x^{7}-28x^{6}+48x^{5}+75x^{4}-90x^{3}-101x^{2}+60x+61}{\left(\left(x-2\right)\left(x+1\right)\right)^{2}}$$

Langkah Penyelesaian Pendek

Untuk menambah atau menolak ungkapan, kembangkannya untuk membuat penyebut mereka sama. Darabkan 2x^{2} kali \frac{\left(x-2\right)\left(x+1\right)}{\left(x-2\right)\left(x+1\right)}.

$$\left(\frac{2x^{2}\left(x-2\right)\left(x+1\right)}{\left(x-2\right)\left(x+1\right)}-\frac{1}{\left(x-2\right)\left(x+1\right)}\right)^{2}-8\left(2x^{2}-1\right)+7$$

Oleh kerana \frac{2x^{2}\left(x-2\right)\left(x+1\right)}{\left(x-2\right)\left(x+1\right)} dan \frac{1}{\left(x-2\right)\left(x+1\right)} mempunyai penyebut yang sama, tolakkan dengan menolakkan pengangka.

$$\left(\frac{2x^{2}\left(x-2\right)\left(x+1\right)-1}{\left(x-2\right)\left(x+1\right)}\right)^{2}-8\left(2x^{2}-1\right)+7$$

Lakukan pendaraban dalam 2x^{2}\left(x-2\right)\left(x+1\right)-1.

$$\left(\frac{2x^{4}+2x^{3}-4x^{3}-4x^{2}-1}{\left(x-2\right)\left(x+1\right)}\right)^{2}-8\left(2x^{2}-1\right)+7$$

Gabungkan sebutan serupa dalam 2x^{4}+2x^{3}-4x^{3}-4x^{2}-1.

$$\left(\frac{2x^{4}-2x^{3}-4x^{2}-1}{\left(x-2\right)\left(x+1\right)}\right)^{2}-8\left(2x^{2}-1\right)+7$$

Untuk meningkatkan \frac{2x^{4}-2x^{3}-4x^{2}-1}{\left(x-2\right)\left(x+1\right)} kepada kuasa, tingkatkan kedua-dua pengangka dan penyebut kepada kuasa dan kemudian bahagi.

$$\frac{\left(2x^{4}-2x^{3}-4x^{2}-1\right)^{2}}{\left(\left(x-2\right)\left(x+1\right)\right)^{2}}-8\left(2x^{2}-1\right)+7$$

Kembangkan \left(\left(x-2\right)\left(x+1\right)\right)^{2}.

$$\frac{\left(2x^{4}-2x^{3}-4x^{2}-1\right)^{2}}{\left(x-2\right)^{2}\left(x+1\right)^{2}}-8\left(2x^{2}-1\right)+7$$

Gunakan sifat kalis agihan untuk mendarab -8 dengan 2x^{2}-1.

$$\frac{\left(2x^{4}-2x^{3}-4x^{2}-1\right)^{2}}{\left(x-2\right)^{2}\left(x+1\right)^{2}}-16x^{2}+8+7$$

Tambahkan 8 dan 7 untuk dapatkan 15.

$$\frac{\left(2x^{4}-2x^{3}-4x^{2}-1\right)^{2}}{\left(x-2\right)^{2}\left(x+1\right)^{2}}-16x^{2}+15$$

Untuk menambah atau menolak ungkapan, kembangkannya untuk membuat penyebut mereka sama. Darabkan -16x^{2}+15 kali \frac{\left(x-2\right)^{2}\left(x+1\right)^{2}}{\left(x-2\right)^{2}\left(x+1\right)^{2}}.

$$\frac{\left(2x^{4}-2x^{3}-4x^{2}-1\right)^{2}}{\left(x-2\right)^{2}\left(x+1\right)^{2}}+\frac{\left(-16x^{2}+15\right)\left(x-2\right)^{2}\left(x+1\right)^{2}}{\left(x-2\right)^{2}\left(x+1\right)^{2}}$$

Oleh kerana \frac{\left(2x^{4}-2x^{3}-4x^{2}-1\right)^{2}}{\left(x-2\right)^{2}\left(x+1\right)^{2}} dan \frac{\left(-16x^{2}+15\right)\left(x-2\right)^{2}\left(x+1\right)^{2}}{\left(x-2\right)^{2}\left(x+1\right)^{2}} mempunyai penyebut yang sama, tambahkan dengan menambahkan pengangka.

$$\frac{\left(2x^{4}-2x^{3}-4x^{2}-1\right)^{2}+\left(-16x^{2}+15\right)\left(x-2\right)^{2}\left(x+1\right)^{2}}{\left(x-2\right)^{2}\left(x+1\right)^{2}}$$

Lakukan pendaraban dalam \left(2x^{4}-2x^{3}-4x^{2}-1\right)^{2}+\left(-16x^{2}+15\right)\left(x-2\right)^{2}\left(x+1\right)^{2}.

$$\frac{4x^{8}-4x^{7}-8x^{6}-2x^{4}-4x^{7}+4x^{6}+8x^{5}+2x^{3}-8x^{6}+8x^{5}+16x^{4}+4x^{2}-2x^{4}+2x^{3}+4x^{2}+1-16x^{6}+32x^{5}+48x^{4}-64x^{3}-64x^{2}+15x^{4}-30x^{3}-45x^{2}+60x+60}{\left(x-2\right)^{2}\left(x+1\right)^{2}}$$

Gabungkan sebutan serupa dalam 4x^{8}-4x^{7}-8x^{6}-2x^{4}-4x^{7}+4x^{6}+8x^{5}+2x^{3}-8x^{6}+8x^{5}+16x^{4}+4x^{2}-2x^{4}+2x^{3}+4x^{2}+1-16x^{6}+32x^{5}+48x^{4}-64x^{3}-64x^{2}+15x^{4}-30x^{3}-45x^{2}+60x+60.

$$\frac{4x^{8}-8x^{7}-28x^{6}+75x^{4}+48x^{5}-90x^{3}-101x^{2}+61+60x}{\left(x-2\right)^{2}\left(x+1\right)^{2}}$$

Kembangkan \left(x-2\right)^{2}\left(x+1\right)^{2}.

$$\frac{4x^{8}-8x^{7}-28x^{6}+75x^{4}+48x^{5}-90x^{3}-101x^{2}+61+60x}{x^{4}-2x^{3}-3x^{2}+4x+4}$$

Kembangkan

$$\frac{4x^{8}-8x^{7}-28x^{6}+48x^{5}+75x^{4}-90x^{3}-101x^{2}+60x+61}{\left(\left(x-2\right)\left(x+1\right)\right)^{2}}$$

Langkah Penyelesaian Pendek

Untuk menambah atau menolak ungkapan, kembangkannya untuk membuat penyebut mereka sama. Darabkan 2x^{2} kali \frac{\left(x-2\right)\left(x+1\right)}{\left(x-2\right)\left(x+1\right)}.

$$\left(\frac{2x^{2}\left(x-2\right)\left(x+1\right)}{\left(x-2\right)\left(x+1\right)}-\frac{1}{\left(x-2\right)\left(x+1\right)}\right)^{2}-8\left(2x^{2}-1\right)+7$$

Oleh kerana \frac{2x^{2}\left(x-2\right)\left(x+1\right)}{\left(x-2\right)\left(x+1\right)} dan \frac{1}{\left(x-2\right)\left(x+1\right)} mempunyai penyebut yang sama, tolakkan dengan menolakkan pengangka.

$$\left(\frac{2x^{2}\left(x-2\right)\left(x+1\right)-1}{\left(x-2\right)\left(x+1\right)}\right)^{2}-8\left(2x^{2}-1\right)+7$$

Lakukan pendaraban dalam 2x^{2}\left(x-2\right)\left(x+1\right)-1.

$$\left(\frac{2x^{4}+2x^{3}-4x^{3}-4x^{2}-1}{\left(x-2\right)\left(x+1\right)}\right)^{2}-8\left(2x^{2}-1\right)+7$$

Gabungkan sebutan serupa dalam 2x^{4}+2x^{3}-4x^{3}-4x^{2}-1.

$$\left(\frac{2x^{4}-2x^{3}-4x^{2}-1}{\left(x-2\right)\left(x+1\right)}\right)^{2}-8\left(2x^{2}-1\right)+7$$

Untuk meningkatkan \frac{2x^{4}-2x^{3}-4x^{2}-1}{\left(x-2\right)\left(x+1\right)} kepada kuasa, tingkatkan kedua-dua pengangka dan penyebut kepada kuasa dan kemudian bahagi.

$$\frac{\left(2x^{4}-2x^{3}-4x^{2}-1\right)^{2}}{\left(\left(x-2\right)\left(x+1\right)\right)^{2}}-8\left(2x^{2}-1\right)+7$$

Kembangkan \left(\left(x-2\right)\left(x+1\right)\right)^{2}.

$$\frac{\left(2x^{4}-2x^{3}-4x^{2}-1\right)^{2}}{\left(x-2\right)^{2}\left(x+1\right)^{2}}-8\left(2x^{2}-1\right)+7$$

Gunakan sifat kalis agihan untuk mendarab -8 dengan 2x^{2}-1.

$$\frac{\left(2x^{4}-2x^{3}-4x^{2}-1\right)^{2}}{\left(x-2\right)^{2}\left(x+1\right)^{2}}-16x^{2}+8+7$$

Tambahkan 8 dan 7 untuk dapatkan 15.

$$\frac{\left(2x^{4}-2x^{3}-4x^{2}-1\right)^{2}}{\left(x-2\right)^{2}\left(x+1\right)^{2}}-16x^{2}+15$$

Untuk menambah atau menolak ungkapan, kembangkannya untuk membuat penyebut mereka sama. Darabkan -16x^{2}+15 kali \frac{\left(x-2\right)^{2}\left(x+1\right)^{2}}{\left(x-2\right)^{2}\left(x+1\right)^{2}}.

$$\frac{\left(2x^{4}-2x^{3}-4x^{2}-1\right)^{2}}{\left(x-2\right)^{2}\left(x+1\right)^{2}}+\frac{\left(-16x^{2}+15\right)\left(x-2\right)^{2}\left(x+1\right)^{2}}{\left(x-2\right)^{2}\left(x+1\right)^{2}}$$

Oleh kerana \frac{\left(2x^{4}-2x^{3}-4x^{2}-1\right)^{2}}{\left(x-2\right)^{2}\left(x+1\right)^{2}} dan \frac{\left(-16x^{2}+15\right)\left(x-2\right)^{2}\left(x+1\right)^{2}}{\left(x-2\right)^{2}\left(x+1\right)^{2}} mempunyai penyebut yang sama, tambahkan dengan menambahkan pengangka.

$$\frac{\left(2x^{4}-2x^{3}-4x^{2}-1\right)^{2}+\left(-16x^{2}+15\right)\left(x-2\right)^{2}\left(x+1\right)^{2}}{\left(x-2\right)^{2}\left(x+1\right)^{2}}$$

Lakukan pendaraban dalam \left(2x^{4}-2x^{3}-4x^{2}-1\right)^{2}+\left(-16x^{2}+15\right)\left(x-2\right)^{2}\left(x+1\right)^{2}.

$$\frac{4x^{8}-4x^{7}-8x^{6}-2x^{4}-4x^{7}+4x^{6}+8x^{5}+2x^{3}-8x^{6}+8x^{5}+16x^{4}+4x^{2}-2x^{4}+2x^{3}+4x^{2}+1-16x^{6}+32x^{5}+48x^{4}-64x^{3}-64x^{2}+15x^{4}-30x^{3}-45x^{2}+60x+60}{\left(x-2\right)^{2}\left(x+1\right)^{2}}$$

Gabungkan sebutan serupa dalam 4x^{8}-4x^{7}-8x^{6}-2x^{4}-4x^{7}+4x^{6}+8x^{5}+2x^{3}-8x^{6}+8x^{5}+16x^{4}+4x^{2}-2x^{4}+2x^{3}+4x^{2}+1-16x^{6}+32x^{5}+48x^{4}-64x^{3}-64x^{2}+15x^{4}-30x^{3}-45x^{2}+60x+60.

$$\frac{4x^{8}-8x^{7}-28x^{6}+75x^{4}+48x^{5}-90x^{3}-101x^{2}+61+60x}{\left(x-2\right)^{2}\left(x+1\right)^{2}}$$

Kembangkan \left(x-2\right)^{2}\left(x+1\right)^{2}.

$$\frac{4x^{8}-8x^{7}-28x^{6}+75x^{4}+48x^{5}-90x^{3}-101x^{2}+61+60x}{x^{4}-2x^{3}-3x^{2}+4x+4}$$