5х² - 9х - 2 = 0
D = b² - 4ac = (-9)² - 4 · 5 · (-2) = 81 + 40 = 121
√D = √121 = 11
х = (-b±√D)/2а
х₁ = (9-11)/(2·5) = (-2)/10 = -0,2
х₂ = (9+11)/(2·5) = 20/10 = 2
Ответ: (-0,2; 2).
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5х² - 9х - 2 = 0
D = b² - 4ac = (-9)² - 4 · 5 · (-2) = 81 + 40 = 121
√D = √121 = 11
х = (-b±√D)/2а
х₁ = (9-11)/(2·5) = (-2)/10 = -0,2
х₂ = (9+11)/(2·5) = 20/10 = 2
Ответ: (-0,2; 2).