10x²+5x=0
25-100x²=0
2x²-14=0
2x²-8=0
4x²-12=0
x²-10x=0
4x²+20x=0
2x²+x=0
3x²-27=0
1) 10x^2+5x=0
5x(2x+1)=0
5x = 0 или (2x+1)=0
x = 0 x = -1/2
2) 25-100x^2=0
25(1-4x^2)=0
1-4x^2=0
4x^2=1
x^2=1/4
x= +- 1/2
3)2x^2-14=0
2(x^2-7)=0
x=√7
4)2x^2-8=0
2(x^2-4)=0
x^2=4
x = -+ 2
5)4x^2-12=0
4(x^2-3)=0
x^2=3
x=√3
6)x^2-10x=0
x(x-10)=0
x=0 x=10
7)4x^2+20x=0
4x(x+5)=0
x = 0 x = -5
8)2x^2+x=0
x(2x+1)=0
x=0 x = - 1/2
9)3x^2-27=0
3(x^2-9) = 0
(x-3)(x+3)=0
x=3 x = -3
10)4x^2+20x=0
x = 0 x = - 5