5х²+3х-8=0 помогите решить. Created by elenoh1. algebra-ru

5х²+3х-8=0 помогите решить...

25hjoerf10 $5 x^{2} +3x-8=0 \\ D=3 ^{2} -4*5*(-8)=9+160=169=13 ^{2} \\ \\ x_{1} = \frac{-3+13}{2*5} =1 \\ \\ x_{2} = \frac{-3-13}{2*5} = -1.6 \\ \\$

Ответ: х₁ = 1; х₂ = - 1,6.

2 votes Thanks 2

МаленькаяМандаринка D=b²-4ac=3²-4·5·(-8)=9+160=169
х1=(-3+13):10=10:10=1
х2=(-3-13):10= -16:10= -1,6
Ответ: х1=1; х2= -1,6

1 votes Thanks 2

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