1) 3x(3x-8)=20

9x^2-24x=20

(3x+2)(3x-10)=0

3x+2=0

3x-10=0

x1= -2/3

x2= 10/3

2)(2x-3)^2=8x

4x^2-20x+9=0

(2x-1)(2x-9)=0

2x-1=0

2x-9=0

x1=1/2

x2=9/2

3)(2x+4)^2=11x^2+1

7x^2-16x-15=0

(7x+5)(x-3)=0

x1= -5/7

x2= 3

4)4x^2-19x+12=0

4x^2 =7

x1= -√7/2

x2=√7/2