1) 2x² - 18 = 02x² = 18x² = 9x = ±3
2) x² + 2x = 0x(x + 2) = 0x = 0 or x = -2
3) 4x² = 0x² = 0x = 0
4) 4x² - 11 = x² - 11 + 9x3x² - 9x = 03x(x - 3) = 0x = 0 or x = 3
Таким образом, решения уравнений:1) x = ±32) x = 0, x = -23) x = 04) x = 0, x = 3
1) 2x² - 18 = 0
2x² = 18
x² = 9
x = ±3
2) x² + 2x = 0
x(x + 2) = 0
x = 0 or x = -2
3) 4x² = 0
x² = 0
x = 0
4) 4x² - 11 = x² - 11 + 9x
3x² - 9x = 0
3x(x - 3) = 0
x = 0 or x = 3
Таким образом, решения уравнений:
1) x = ±3
2) x = 0, x = -2
3) x = 0
4) x = 0, x = 3