1) x2 +3x = 0
2) 8x2+9 = 4
3) 4m2-81 = 0
4) 5x2-10x = 0
5) 2x2+5 = 10
6) 4x2+6x = 0
7) 6x2-36x = 0
8) 5x2-15 = 0
9) 10x2+8 = 9
10) 4x2-12 = 0