Question

[Lê Đoàn Song Tú]

\(\left(x^2_{ }+1\right)\left(x-3\right)-\left(x-3\right)\left(x^2-1\right)\)

rút gọn biểu thức

Answer 1

[Nguyễn Lê Phước Thịnh]

\(=\left(x-3\right)\left(x^2+1-x^2+1\right)=2\left(x-3\right)\)

Answer 2

[Tường Vy]

(x² + 1)(x - 3) - (x - 3)(x² - 1)
= [x² + 1 - (x² - 1)](x - 3)

= (x² + 1 - x² + 1)(x - 3)

= 2(x - 3)