Question

1.rozwiąż równanie:

a) -4(2x-5) = 2(3x+7)

b) \frac{2}{3}x-13=\frac{1}{3}(x+9)

c) \frac{3}{5}(2x-7)=\frac{7}{15}(3+x)

d) \frac{5x-4}{6}-\frac{7-2x}{2}=0

e) x(x-3)=(x+2)^{2}

Answer 1

a

-4(2x-5) = 2(3x+7)

-8x+20=6x+14

-14x=-6

x=3/7

 

b

=

2/3x-13=1/3x+3

1/3x=16

x=48

 

c

=

6/5x-21/5=21/15+7/15x

18/15x-7/15x=21/15+63/15

11/15x=84/15

x=84/11=7i7/11

 

d

5x-4-3(7-2x)=0

5x-4-21+6x=0

11x=25

x=25/11=2i3/11

 

e

x(x-3)=(x+2)^2

x^2-3x=x^2+4x+4

-7x=4

x=-4/7