Question

Помогите решить очень срочно. Задание во вложнии

Answer 1

7x+132/(x-1)+57=0

7x^2-7x+132+57x-57=0

7x^2+50x+75=0

(-25+-10)/7

x1=-5

x2=-15/7

2/)

4x^2+4x+13x+13-28=0

4x^2+17x-15=0

[-17+-sqrt(289+240)]/8=[-17+-23]/8

x1=-5 x2=3/4

3) 1+x+1/(x+3)=0

x^2+3+4x+1=0

x^2+4x+4=0

(x+2)^2=0

x=-2

4) (4-x)/)x-4)-6=x

-1-6=x

x=-7

5)

-20-88/(x-5)=3x

(-20x+100-88)=3x^2-15x

3x^2-15x+20x-12=0

3x^2+5x-12=0

x1=-3

x2=4/3

Answer 2

7х(х-1)+132=-57(х-1)

7х^2-7x+132+57x-57=0

7x^2+50x+75=0

D=2500-4*7*75=400

x1=(-50+20)/14=-30/14=-15/7=-2целых1/7

x2=(-50-20)/14=-70/14=-5

 

 

-4x(x+1)-13(x+1)=-28

-4x^2-4x-13x-13+28=0

-4x^2-17x+15=0

D=289-4*(-4)*15=529

x1=(17+23)/(-8)=-5

x2=(17-23)/(-8)=3/4

 

x+3+1=-x(x+3)

x+4+x^2+3x=0

x^2+4x+4=0

D=16-16=0

x=-4/2=-2

 

4-x-6(x-4)=x(x-4)

4-x-6x+24=x^2-4x

x^2+3x-28=0

D=9+4*28=121

x1=(-3+11)/2=4

x2=(-3-11)/2=-7

 

-20(x-5)-88=3x(x-5)

-20x+100-88=3x^2-15x

3x^2+5x-12=0

D=25+4*3*12=169

x1=(-5+13)/6=8/6=4/3

x2=(-5-13)/6=-3