Question

Rozwiąż równania:
1) 11-x= 3x + 8
2) -7(x+2)+4=-3x
3) 2x(x-1)=2(x-1)(x+3)

Answer 1

1)
11 - x = 3x + 8
11=3x + 8 +x
11-8=3x +x
4x = 3
x=0.75

2) -7 (x+2) +4 = 3x
-7x -14 +4=3x
-7x -10 = 3x
-10=3x+7x
-10=10x
x = -1

3) [2] - to oznacza że do potęgi drugiej
 2x(x-1)=2(x-1)(x+3)
2x[2] - 2x = (2x-2)(x+3)
2x[2] - 2x = 2x[2] + 6x - 2x - 6
2x[2] - 2x = 2x[2] +4x - 6
6 + 2x[2] - 2x = 2x[2] + 4x
6 = 6x
x=1

Answer 2

1) 11-x=3x+8
-x-3x=8-11
-4x=-3/:-4
x=3/4

2)-7x-14+4=-3x
-10=4x/:4
x=-2.5