<img src="https://tex.z-dn.net/?f=%20x%5E%7B2%7D%20-9%20%3D%200" />
(x + 3)(x - 3) = 0
x = 3 y x = - 3
CS = ( - 3 ; 3)
<img src="https://tex.z-dn.net/?f=%20x%5E%7B2%7D%20-1%20%3D%200" />
(x + 1)(x - 1) = 0
x = 1 y x = - 1
CS = ( - 1 ; 1)
<img src="https://tex.z-dn.net/?f=2%20x%5E%7B2%7D%20-2%20%3D%200" />
<img src="https://tex.z-dn.net/?f=2%28x%5E%7B2%7D%20-1%29%20%3D%200" />
<img src="https://tex.z-dn.net/?f=%20x%5E%7B2%7D%20-1%20%3D%20%20%5Cfrac%7B0%7D%7B2%7D%20" />
<img src="https://tex.z-dn.net/?f=%20x%5E%7B2%7D%20-1%20%3D%20%200%20" />
(x + 1)(x - 1) = 0
x = 1 y x = - 1
CS = ( - 1 ; 1)
<img src="https://tex.z-dn.net/?f=%203x%5E%7B2%7D-75%20%3D%200%20" />
<img src="https://tex.z-dn.net/?f=%203%28x%5E%7B2%7D-25%29%3D%200%20" />
<img src="https://tex.z-dn.net/?f=%20%28x%5E%7B2%7D-25%29%3D%20%20%5Cfrac%7B0%7D%7B3%7D%20%20" />
<img src="https://tex.z-dn.net/?f=%20%28x%5E%7B2%7D-25%29%3D%200" />
(x + 5)(x - 5) = 0
x = 5 y x = - 5
CS = ( - 5 ; 5).