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x2 + 1/ x-3 + 2x / x- 3 = 4x-12
x2 + 2x + 1 / x - 3 = 4x - 12
Stosujemy zasade proporcji
x2 + 2x + 1 = (x-3) (4x - 12)
x2 + 2x + 1 = 4x2 - 12x - 12x+ 36
-3x2+26x - 35 = 0
delta = 676 - 420 = 256
pierw z delta = 16
x1 =( -26 - 16)/-6= 7
x2 = -26 + 16 / -6 = 10/6