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S1mber
@S1mber
July 2022
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1. 2x + 8x² = 0
2. 2x² - 7x + 6 = 0
3. x² - x = 2x -5
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хитман6
1)2x+8x^2=0
2x (1+4x)=0
x (1+4x)=0
x=0
1+4x=0
x=0
x=-1/4
x1=-1/4
x2=0
2)2x^2-7x+6=0
a=2 b=-7 c=6
D=b^2-4ac=(-7)^2-4*2*6=49-48=1
x1,2=-b плюс минус квадратный корень из дискриминанта/2a
x1=7+1/4=2
x2=7-1/4=3/2
x1=3/2
x2=2
3)x^2-x=2x-5
x^2-x-2x+5=0
x^2-3x+5=0
a=1 b=-3x c=5
D=b^2-4ac=(-3)^2-4*1*5=9-20=-11
x=3+- -11 под корнем
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Answers & Comments
2x (1+4x)=0
x (1+4x)=0
x=0
1+4x=0
x=0
x=-1/4
x1=-1/4
x2=0
2)2x^2-7x+6=0
a=2 b=-7 c=6
D=b^2-4ac=(-7)^2-4*2*6=49-48=1
x1,2=-b плюс минус квадратный корень из дискриминанта/2a
x1=7+1/4=2
x2=7-1/4=3/2
x1=3/2
x2=2
3)x^2-x=2x-5
x^2-x-2x+5=0
x^2-3x+5=0
a=1 b=-3x c=5
D=b^2-4ac=(-3)^2-4*1*5=9-20=-11
x=3+- -11 под корнем