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dershi
@dershi
July 2022
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Помогите решить уравнения начиная с буквы "д"
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Nokeas
Д) x^2+3x-10=0
D= 3^2-4*1*(-10)=9+40=49=√7
x1= 3+7/2= 5
x2= 3-7/2= -2
е) x^2+9x+14=0
D= 9^2-4*1*14= 81-56= 25=√5
x1=9+5/2=7
x2=9-5/2=2
ж) x^2-4x+3=0
D=4^2-4*1*3=16-12=4=√2
x1=4+2/2=3
x2=4-2/2=1
з)x^2-2x-1=0
D=2^2-4*1*(-1)=4-4=0
x1=2+0/2=1
x2=2-0/2=1
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Answers & Comments
D= 3^2-4*1*(-10)=9+40=49=√7
x1= 3+7/2= 5
x2= 3-7/2= -2
е) x^2+9x+14=0
D= 9^2-4*1*14= 81-56= 25=√5
x1=9+5/2=7
x2=9-5/2=2
ж) x^2-4x+3=0
D=4^2-4*1*3=16-12=4=√2
x1=4+2/2=3
x2=4-2/2=1
з)x^2-2x-1=0
D=2^2-4*1*(-1)=4-4=0
x1=2+0/2=1
x2=2-0/2=1