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x(x - 2) = 0
x1 = 0; x2 = 2
b) x^2 = 7x
x^2 - 7x = 0
x(x - 7) = 0
x1 = 0; x2 = 2
c) 12x = 3x^2 /;3
4x = x^2
4x - x^2 = 0
x(4 - x) = 0
x1 = 0; x2 = 4
d) (x - 3)^2 = 0
(x - 3)(x - 3) = 0
x1 = x2 = 3
e) (x + 1)(x - 1) = 0
x1 = 1; x2 = -1
f) (2x -3)² = 0
4x² - 12x + 9 = 0
D: 12² - 4.4.9 = 0
x1 = x2 = -b/2a = 12/8 = 3/2
Pozdrawiam :-)