1)x(7x-3)=0
x=0 7x-3=0
7x=3
x= 3/7
2)3(x-1)² +5(x-1)-2=0
(x-1)[(x-1)(3+5)]-2=0
x-1=0 ∧ 8(x-1)=0
x=1 8x-8=0
8x=8
x=1
3)3x² +3x +10x+10=0
3x(x+1)+10(x+1)=0
(x+1)(3x+10)=0
x+1=0 ∧3x+10=0
x= -1 3x= -10
x= -10/3
4)(x-3)²=0
|x-3|=0
x-3=0
x=3
5)(3x-4)(3x+4)=0
3x-4=0 3x+4=0
3x=4 3x= -4
x= 4/3 x= -4/3
