4x + 9 = 17
b) -3x - 25 = -5x – 3
c) 4x + 2 – 3x = 4 – 5x + 6
d) 4(2x – 1) + 3x = 6x + 5
j) (x + 2)(2x – 6) = 0 DAJE 20PKT I NAJLEPSZĄ ODP PROSZE SZYBKO


Odpowiedź :

4x + 9 = 17

4x = 17 - 9

4x = 8 / : 4

x = 2

-3x - 25 = -5x - 3

-3x + 5x = -3 + 25

2x = 22 / : 2

x = 11

4x + 2 - 3x = 4 - 5x + 6

4x - 3x + 5x = 4 + 6 - 2

6x = 8 / : 6

x = 8/6

x = 4/3

4(2x - 1) + 3x = 6x + 5

8x - 4 + 3x = 6x + 5

8x + 3x - 6x = 5 + 4

5x = 9 / : 5

x = 1,8

(x + 2)(2x - 6) = 0

x + 2 = 0

2x - 6 = 0

x = 2

x = 3