Решите уравнения 2-3х=5х^2. Created by zabrovskii68. algebra-ru

Решите уравнения 2-3х=5х^2...

zhenyaM2002

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2-3х = 5х²
5х²-2+3х=0
5х²+3х-2=0
D = 9 - 4*5*(-2) = 9+40=49 ; √D= 7
x₁= (-3 -7)/ (2*5) = -10/10 = -1
x₂= (-3+7)/10 = 4/10 =0.4

4 votes Thanks 8

litanalove не то нажала, √49 =7, а не 9

zhenyaM2002 извините) действительно запарился)

litanalove 2 -3x =5x²

-5x² -3x +2 =0, *(-1)

5x² +3x -2 =0

D =b² -4ac
(a =5, b =3, c= -2)

D =9 +4*5*2 =49 =7²

x1,x2 =(-b+-√D)/2a

x1 =(-3 -7)/10 = -1

x2 =(-3 +7)/10 =0.4

ответ: x= -1, x =0.4

3 votes Thanks 5

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