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юля1551
@юля1551
July 2022
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3x^2+7x-20=0
помогите
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dasdasfa
D=49-4*3*(-20)=49+240=289=17^2;
x1=(-7-17)/6=-4; x2=(-7+17)/6=5/3
Ответ -4; 5/3
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kawerza2016
D=b^2-4ac=7^2-4*3*(-20)=49+240=289(из корня это будет 17)
Х1=-b+кореньD/2a=-7+17/2*3=10/6=5/3
X2=-b-кореньD/2a=-7-17/2*3=-24/6=-4
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Answers & Comments
x1=(-7-17)/6=-4; x2=(-7+17)/6=5/3
Ответ -4; 5/3
Х1=-b+кореньD/2a=-7+17/2*3=10/6=5/3
X2=-b-кореньD/2a=-7-17/2*3=-24/6=-4