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3x 2 = 0
x -4 = 0
(3x + 2)(x - 4) = 0
3x + 2 = 0 o x - 4 = 0
3x = -2 x = 4
x = -2/3
cs: x∈{-2/3; 4}
2x² + 4x = 30
2x² + 4x - 30 = 0
x² + 2x - 15
(x + 5)(x - 3) = 0
x + 5 = 0 o x - 3 = 0
x = -5 o x = 3
cs: x∈{-5; 3}
5x² = 39 - 2x
5x² + 2x - 39 = 0
5x -13 = 0
x +3 =0
(5x - 13)( x + 3) = 0
5x - 13 = 0 o x + 3 = 0
5x = 13 o x = -3
x = 13/5
cs: x∈{-3; 13/5}