1) y=-2*(-2)=4
y=-2*(-1)=2
y=-2*0=0
y=-2*2=-4
2) 20y=20*(-2)+4
20y=-40+4
20y=-36
y=-1.8
20y=20*(-1)+4
20y=-20+4
20y=-16
y=-0.8
20y=20*0+4
20y=4
y=0.2
20y=20*2+4
20y=44
y=2.2
(x² -2x +3) * 3x = x² *3x - 2x*3x +3*3x = 3x³ - 6x² +9x
X^2+8x+16 = (x+4)^2
(x-1)(x+4)^2-6(x+4) = 0
(x+4)((х-1)(х+4)-6) = 0
х+4=0, или (х-1)(х+4)-6 = 0
х= -4 x^2+4x-x-4-6 = 0
x^2+3x-10 = 0
D = 9 + 40 = 49
x1 = (-3+7) /2 = 2
x2 = (-3-7)/2 = -5
Ответ: х1 = -4; х2 = 2; х3 = -5