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ElenaPanchuk
@ElenaPanchuk
July 2022
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х в квадрате - 14х -72=0
решите уровнение
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ВикаВикторовна
Verified answer
Х²-14х-72=0
a=1, b= -14, c= -72
D = b²-4ac = (-14)² - 4*1*(-72) = 196+288 = 484
√D = √484 = 22
x₁ = (-b-√D) / 2a = (14-22) / 2 = -4
x₂ = (-b+√D) / 2a = (14+22) / 2 = 18
5 votes
Thanks 8
ElenaPanchuk
спасибо
ElenaPanchuk
а можешь еще вот этот решить?
ElenaPanchuk
х в квадрате +16х-51=0
ВикаВикторовна
D = 256+204 = 460, √D = √460, не извлекается
ВикаВикторовна
х1 = (-16-√460)/2; х2 = (-16+√460)/2
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Answers & Comments
Verified answer
Х²-14х-72=0a=1, b= -14, c= -72
D = b²-4ac = (-14)² - 4*1*(-72) = 196+288 = 484
√D = √484 = 22
x₁ = (-b-√D) / 2a = (14-22) / 2 = -4
x₂ = (-b+√D) / 2a = (14+22) / 2 = 18