Ответ:
Объяснение:
-5x² + 20 = 14x - 4
-5x² - 14x = -20 -4
-5x² - 14x = -24
-5x² - 14x + 24 = 0
D = b² - 4*a*c
D = (-14)² - 4*(-5)*24 = 676
√D = 26
x₁ = (-b +√D)/2a = (14 + 26)/(-5*2) = -4
x₂ = (-b - √D)/2a = (14 -26)/(-5*2) = 1.2
Ответ: -4; 1,2.
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Ответ:
Объяснение:
-5x² + 20 = 14x - 4
-5x² - 14x = -20 -4
-5x² - 14x = -24
-5x² - 14x + 24 = 0
D = b² - 4*a*c
D = (-14)² - 4*(-5)*24 = 676
√D = 26
x₁ = (-b +√D)/2a = (14 + 26)/(-5*2) = -4
x₂ = (-b - √D)/2a = (14 -26)/(-5*2) = 1.2
Ответ: -4; 1,2.