Question

1)

x(x-5)-x(x+4)=-63

2)

2(x-1)+4(x-3)=-3(x-2)+9x

3)

x+x/2=-x+1/3 (te ukośniki to ułamki)

Answer 1

1.

x(x-5)-x(x+4)=-63

x²-5x-x²-4x=-63

-9x=-63/:(-9)

x=7

 

2.

2(x-1)+4(x-3)=-3(x-2)+9x

2x-2+4x-12=-3x+6+9x

6x-14=-6x+6

6x+6x=6+14

12x=20/:12

x=1 8/12

x=1 2/3

 

3.

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

x+1/2x+x=1/3

2 1/2x=1/3

5/2x=1/3/*2/5

x=2/15

Answer 2

1.

x(x-5)-x(x+4) = -63

x^2 -5x -x^2 -4x = -63

-9x = -63/:(-9)

x = 7

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2.

2(x-1)+4(x-3) = -3(x-2)+9x

2x-2+4x-12 = -3x+6+9x

6x-6x = 6+14

0 = 20

====== równanie sprzeczne

3.

x+x/2 = -x+1/3   I*6

6x+3x = -6x+2

15x = 2/:15

x = 2/15

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