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Plakatina99
@Plakatina99
July 2022
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помогите Срочно*-* заранее огромное спасибо
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igorek1988
2. (х-3)(х+3)/(х+3)(х-5)=х-3/х-5
3. 3х=4-х^2/x |*x x≠0
3x^2=4-x^2
3x^2+x^2=4
4x^2=4
x^2=4:4
x^2=1
x1=-1 x2=1
4. 15+3x=(1-x)^2
15+3x=1-2x+x^2
x^2-2x+1-15-3x=0
x^2-5x-14=0
D=25-4*1*(-14)=81, D>0 2 корня
x1=5-9/2= -4/2=-2 x2=5+9/2=7
Ответ: -2;7
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Answers & Comments
3. 3х=4-х^2/x |*x x≠0
3x^2=4-x^2
3x^2+x^2=4
4x^2=4
x^2=4:4
x^2=1
x1=-1 x2=1
4. 15+3x=(1-x)^2
15+3x=1-2x+x^2
x^2-2x+1-15-3x=0
x^2-5x-14=0
D=25-4*1*(-14)=81, D>0 2 корня
x1=5-9/2= -4/2=-2 x2=5+9/2=7
Ответ: -2;7