a) c² + 9 = 6cc² - 6c + 9 = 0(c - 3)² = 0c - 3 = 0c = 3
б) 2x² - 2 - 4x = 02x² - 4x - 2 = 0x² - 2x - 1 = 0(x - (1 + √2))(x - (1 - √2)) = 0x = 1 + √2, x = 1 - √2
в) y² + 4 = 4yy² - 4y + 4 = 0(y - 2)² = 0y - 2 = 0y = 2
г) x - 1 = 0,25x²0,25x² - x + 1 = 0x² - 4x + 4 = 0(x - 2)² = 0x - 2 = 0x = 2
a) c² + 9 = 6c
c² - 6c + 9 = 0
(c - 3)² = 0
c - 3 = 0
c = 3
б) 2x² - 2 - 4x = 0
2x² - 4x - 2 = 0
x² - 2x - 1 = 0
(x - (1 + √2))(x - (1 - √2)) = 0
x = 1 + √2, x = 1 - √2
в) y² + 4 = 4y
y² - 4y + 4 = 0
(y - 2)² = 0
y - 2 = 0
y = 2
г) x - 1 = 0,25x²
0,25x² - x + 1 = 0
x² - 4x + 4 = 0
(x - 2)² = 0
x - 2 = 0
x = 2