1) y - 4y² = 0y(1 - 4y) = 0y = 0 или 1 - 4y = 0y = 0 или y = 1/4
2) (x-8)(x+5) = -40x² - 3x - 40 = 0(x - 8)(x + 5) = 0x - 8 = 0 or x + 5 = 0x = 8 or x = -5
3) (x-8)(x+2) = -6xx² - 6x - 16 = -6xx² - 16 = 0(x + 4)(x - 4) = 0x + 4 = 0 or x - 4 = 0x = -4 or x = 4
1) y - 4y² = 0
y(1 - 4y) = 0
y = 0 или 1 - 4y = 0
y = 0 или y = 1/4
2) (x-8)(x+5) = -40
x² - 3x - 40 = 0
(x - 8)(x + 5) = 0
x - 8 = 0 or x + 5 = 0
x = 8 or x = -5
3) (x-8)(x+2) = -6x
x² - 6x - 16 = -6x
x² - 16 = 0
(x + 4)(x - 4) = 0
x + 4 = 0 or x - 4 = 0
x = -4 or x = 4