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- 0,3(0,49x² + 1,4x + 1) = - 6
- 0,147x² - 0,42x - 0,3 + 6 = 0
- 0,147x² - 0,42x + 5,7 = 0
a = - 0,147
b = - 0,42
c = 5,7
Δ = b² - 4 * a * c = (- 0,42)² - 4 * - 0,147 * 5,7 = 0,1764 + 3,3516 = 3,528
√Δ = √3,528
x₁ = (0,42 - √3,528)/- 0,294
x₂ = (0,42 + √3,528)/- 0,294