Question

1)  Rút gọn C = ( 3x- 5) ( 2x + 11 ) - (2x + 3) ( 3x + 7) 

2) Thực hiện phép tính ( 2x⁴+ 2x³ - 7x² -x +3) : ( 2x² - 1)

3) Tìm x : ( x+ 4) ( x² - 4x + 16) - x ( x- 5) (x+ 5) = 264

Answer 1

Bài 3: 

\(\Leftrightarrow x^3+64-x^3+25x=264\)

hay x=8

Answer 2

\(1,C=6x^2+23x-55-6x^2-23x-21=-76\\ 2,=\left(2x^4-x^2+2x^3-x-6x^2+6-3\right):\left(2x^2-1\right)\\ =\left[\left(2x^2-1\right)\left(x^2+x-6\right)-3\right]:\left(2x^2-1\right)\\ =x^2+x-6\left(dư.-3\right)\\ 3,\Leftrightarrow x^3+64-x^3+25x=264\\ \Leftrightarrow25x=200\Leftrightarrow x=8\)