2.x？ +2x6+27+9=9

(x+6)？ =9

x+6= 3

x 1=-3，x2=-9

3.x(5x+4)=5x+4

x(5x+4)-5x-4=0

x(5x+4)-(5x+4)=0

(x- 1)(5x+4)=0

x 1= 1，x2=-4/5

4.(-3x)？ +22x-24=0

9x？ +22x-24=0

△=(b？ -4ac)/2a= 1298>0

∴x=(b？ √ 1298)/2a

Do the following things yourself.

5.(3x+2)x(x+3)=3x？ + 1 1x+6

6.2(x+3)？ =x(x+3)

(x+3)(x+6)=0

x 1=-3，x2=-6

7.

8.(x+ 1)？ -3(x+ 1)+2=0

(x+ 1)(x-2)+2=0

x？ -x=0

x(x- 1)=0

x 1=0，x2= 1

It's too tiring to play so much. Take it.