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x^2-4x^2+ x + 32x-12 x-12-64+4=0
-3x^2+21x-72=0/-3
x^2-7x+24=0
delta=49-96=-47
brak pierwiastków
x² - 3x + 4x - 12 = 4 [(x-4)(x-4)] + 6x - 4
x² + x - 12 = 4 [ x² - 4x - 4x + 16 ] + 6x - 4
x² + x - 12 = 4x² - 16x - 16x + 64 + 6x - 4
x² + x - 12 = 4x² - 26x + 60
- 3x² + 27x - 72 =0
Δ = 27² - [(-72)*(-3)*4)= 729 - 864 = -135
brak rozwiazan