1) x^2 - 9 = 0x^2 = 9x = ±3
2) 121 - x^2 = 0x^2 = 121x = ±11
3) y^2 - 4 = 0y^2 = 4y = ±2
4) 1.96 - y^2 = 0y^2 = 1.96y = ±√1.96y = ±1.4
1) x^2 - 9 = 0
x^2 = 9
x = ±3
2) 121 - x^2 = 0
x^2 = 121
x = ±11
3) y^2 - 4 = 0
y^2 = 4
y = ±2
4) 1.96 - y^2 = 0
y^2 = 1.96
y = ±√1.96
y = ±1.4