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(x^3 - 4x^2) -(3x-12) = 0;
x^2(x-4) - 3(x-4) = 0;
(x-4)(x^2 - 3) = 0;
x - 4 =0; ⇒ x1 = 4;
x^2 - 3 = 0; ⇒ x^2 = 3;⇒
x2 = sgrt3;
x3 = - sgrt3.
x1 * x3= - 4 sgrt3.
7x= 2*6x*√m
7=12√m
√m=7/12
m= 49/144
36x²-7x+49/144= (6x-7/12)²
X² +18x-19=0
D=18² -4*(-19)=324+76=400
x₁=(-18-20)/2=-19
x₂=(-18+20)/2=1
Ответ: -19; 1.