Question

Answer 1

9: \(\Leftrightarrow x^2+6x+9-x^2-8x+4x+32=1\)

=>2x+41=1

=>2x=-40

hay x=-20

10: \(\Leftrightarrow3x^2-6x+3-3x^2+15x=1\)

=>9x=-2

hay x=-2/9

11: \(\Leftrightarrow x^3-6x^2+12x-8-x^3+6x^2=4\)

=>12x-8=4

hay x=1

12: \(\Leftrightarrow6x-3x^2-2x^2+2=-5x^2+15x\)

=>15x=6x+2

=>9x=2

hay x=2/9

Answer 2

\(9,x^2+6x+9-\left(x^2+4x-32\right)=1\\ x^2+6x+9-x^2-4x+32-1=0\\ 2x+40=0\\ 2x=-40\\ x=-20\\ 10,3x^2-6x+3-3x^2+15x-1=0\\ 9x+2=0\\ 9x=-2\\ x=-\dfrac{2}{9}\\ 11,x^3-6x^2+12x-8-x^3+6x^2-4=0\\ 12x-12=0\\ x=1\)