urgent math merci d avance

(2x+1)² = 25
(2x+1)² -25 =0
(2x+1)² -5² =0
(2x+1-5)(2x+1+5) =0
(2x-4)(2x+6) =0

2x-4 =0                2x+6 = 0
2x = 4                  2x = -6
x = 4/2 =2              x =  -6/2 = -3


3x²-4x = 0
x(3x-4) = 0

x =0                 3x-4 =0
                          3x = 4
                            x = 4/3


4x²-12x+9 = 0
(2x-3)² =0

2x-3 =0
2x = 3
x = 3/2

4-(x-3)² =0
2² -(x-3)² =0
(2 -x+3)(2 +x-3) =0
(-x +5)(x-1) =0

-x +5 = 0                    x-1 =0
-x = -5                         x = 1
x = 5


9x²+6x+1 =0
(3x+1)² =0

3x+1 =0
3x = -1
x = -1/3



5x-15x² = 0
5x(1 -3x) = 0

5x =0                    1-3x =0
x =0                            -3x = -1
                                     x = -1/-3 = 1/3



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