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единорог20160
@единорог20160
August 2022
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Решите пожалуйста уравнение! Желательно подробно!
1) [tex]2 x^{2} - x - 3 = 0[/tex]
2) [tex]4 x^{2} - 17 x - 15 = 0[/tex]
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DariosI
Verified answer
1) 2x²-x-3=0
D=1²+4*3*2=25=5²
x₁=(1-5)/(2*2)=-4/4=-1
x₂=(1+5)/(2*2)=6/4=3/2=1.5
2)4x²-17x-15=0
D=17²+4*4*15=289+240=529=23²
x₁=(17-23)/8=-6/8=-0.75
x₂=(17+23)/8=40/8=5
0 votes
Thanks 1
m11m
Verified answer
1) 2x² -x - 3=0
D=(-1)² -4*2*(-3)=1+24=25=5²
x₁=(1-5)/(2*2)=-4/4= -1
x₂=(1+5)/4=6/4=1.5
Ответ: -1; 1.5.
2) 4x² -17x-15=0
D=(-17)² -4*4*(-15)=289+240=529=23²
x₁=(17-23)/(2*4)=-6/8= -0.75
x₂=(17+23)/8=5
Ответ: -0,75; 5.
0 votes
Thanks 1
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Answers & Comments
Verified answer
1) 2x²-x-3=0D=1²+4*3*2=25=5²
x₁=(1-5)/(2*2)=-4/4=-1
x₂=(1+5)/(2*2)=6/4=3/2=1.5
2)4x²-17x-15=0
D=17²+4*4*15=289+240=529=23²
x₁=(17-23)/8=-6/8=-0.75
x₂=(17+23)/8=40/8=5
Verified answer
1) 2x² -x - 3=0D=(-1)² -4*2*(-3)=1+24=25=5²
x₁=(1-5)/(2*2)=-4/4= -1
x₂=(1+5)/4=6/4=1.5
Ответ: -1; 1.5.
2) 4x² -17x-15=0
D=(-17)² -4*4*(-15)=289+240=529=23²
x₁=(17-23)/(2*4)=-6/8= -0.75
x₂=(17+23)/8=5
Ответ: -0,75; 5.