32) (2 + 3x + x²)(12 + 7x + x²) = 0
(x² + 3x + 2)(x² + 7x + 12) = 0
(x + 2)(x + 1)(x + 3)(x + 4) = 0
x + 2 = 0 x + 1 = 0 x + 3 = 0 x + 4 = 0
x₁ = - 2 x₂ = - 1 x₃ = - 3 x₄ = - 4
3) (1 - 2x² + x)(5 - 10,5x + x²) = 0
( - 2x² + x + 1)(x² - 10,5x + 5) = 0
- 2x² + x + 1 = 0
2x² - x - 1 = 0
D = (-1)² - 4 * 2 * (- 1) = 1 + 8 = 9 = 3²
4) (12 - 7x + x²)(5x - 1 - 6x²) = 0
(x² - 7x + 12)(- 6x² + 5x - 1) = 0
x² - 7x + 12 = 0
x₁ = 3 x₂ = 4
- 6x² + 5x - 1 = 0
6x² - 5x + 1 = 0
D = (- 5)² - 4 * 6 * 1 = 25 - 24 = 1
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32) (2 + 3x + x²)(12 + 7x + x²) = 0
(x² + 3x + 2)(x² + 7x + 12) = 0
(x + 2)(x + 1)(x + 3)(x + 4) = 0
x + 2 = 0 x + 1 = 0 x + 3 = 0 x + 4 = 0
x₁ = - 2 x₂ = - 1 x₃ = - 3 x₄ = - 4
3) (1 - 2x² + x)(5 - 10,5x + x²) = 0
( - 2x² + x + 1)(x² - 10,5x + 5) = 0
- 2x² + x + 1 = 0
2x² - x - 1 = 0
D = (-1)² - 4 * 2 * (- 1) = 1 + 8 = 9 = 3²
4) (12 - 7x + x²)(5x - 1 - 6x²) = 0
(x² - 7x + 12)(- 6x² + 5x - 1) = 0
x² - 7x + 12 = 0
x₁ = 3 x₂ = 4
- 6x² + 5x - 1 = 0
6x² - 5x + 1 = 0
D = (- 5)² - 4 * 6 * 1 = 25 - 24 = 1