Question

zad1

a) 13x-8(3x-2) = -7x - 5(12-3x)

b) 7(2x-1)-6(11-x) = 3(x+4)

c) (x+5)(x+2)-3(4x-3)= (x-5)^2

d) 12-2(x-1)^2 = 4(x-2)-(x-3)(2x-5)

e) (x-3)(x+3)-(2x-1)^2 = x(6-3x)-9

f) 3(x+2)^2 + (2x-1)^2 -7(x+3)(x-3)=28

Answer 1

a) 13x-8(3x-2) = -7x - 5(12-3x)

13x - 24x +16 +7x+60-15x=0

-19x=-76

x=4

 

b) 7(2x-1)-6(11-x) = 3(x+4)

14x-7-66+6x-3x-12=0

17x=88

x=5

 

c) (x+5)(x+2)-3(4x-3)= (x-5)^2

x^2+7x+10-12x+9-x^2+10x-25=0

5x=6

x=6/5

 

d) 12-2(x-1)^2 = 4(x-2)-(x-3)(2x-5)

12-2x^2 +4x -2 -4x+8+2x^2-11x+15=0

-11x=-33

x=3

 

e) (x-3)(x+3)-(2x-1)^2 = x(6-3x)-9

x^2-9-4x^2+4x-1-6x+3x^2+9=0

-2x=1

x=-(1/2)

 

f) 3(x+2)^2 + (2x-1)^2 -7(x+3)(x-3)=28

3x^2+12x+12+4x^2-4x-1-7x^2+63-28=0

8x=-48

x= -(5 i 3/4)

 

Answer 2

moje rozwiazanie jest w załaczniku. ; )))