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NoName1513
@NoName1513
July 2022
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Помогите пожалуйста.
1) 5х-10х+(х-2)=0
2) (х в квадрате + 7x)-4x-28=0
3)3x в квадрате+12х-(х+4)=0
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zaraa9656
1) 5x-10x+(x-2)=0
5x-10x+x-2=0
-4x-2=0
-4x=2
x=-2
Ответ: x=-2
2) (x^2+7x)-4x-28=0
X^2+7x-4x-28=0
X^2+3x-28=0
Д=9-4•1•(-28)=9-112=121
X1=(-3-11)/2=-7
X2=(-3+11)/2=4
Ответ: x1=-7; x2=4
3)3x^2+12x-(x+4)=0
3x^2+12x-x-4=0
3x^2+11x-4=0
Д=121-4•3•(-4)=121+48=169
X1=(-11-13)/(2•3)=(-11-13)/6=-24/6=-4
X2=(-11+13)/(2•3)=2/6=1/3
Ответ: x1=-4; x2=1/3
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Answers & Comments
5x-10x+x-2=0
-4x-2=0
-4x=2
x=-2
Ответ: x=-2
2) (x^2+7x)-4x-28=0
X^2+7x-4x-28=0
X^2+3x-28=0
Д=9-4•1•(-28)=9-112=121
X1=(-3-11)/2=-7
X2=(-3+11)/2=4
Ответ: x1=-7; x2=4
3)3x^2+12x-(x+4)=0
3x^2+12x-x-4=0
3x^2+11x-4=0
Д=121-4•3•(-4)=121+48=169
X1=(-11-13)/(2•3)=(-11-13)/6=-24/6=-4
X2=(-11+13)/(2•3)=2/6=1/3
Ответ: x1=-4; x2=1/3