Answer:
1. -2x+8x=-9x²
[tex]x = 0[/tex]
[tex]x = - \frac{ 2}{3} [/tex]
2. 7x+x²+1=0
[tex]x = \frac{ - 7 + 3 \sqrt{5} }{2} \\ [/tex]
[tex]x = \frac{ - 7 - 3 \sqrt{5} }{2} [/tex]
3. x²-6x= 0
x= 0
x= 6
4. 2x²=x+10
[tex]x = \frac{5}{10} [/tex]
[tex]x = - 2[/tex]
