👤

Rozwiąż równania 2x+16=77 13x-2=5x-66 2(x-2)=6x+24 (x-2)(x+2)=x^2-2x

Odpowiedź :

2x+16=77

2x = 77 - 16

2x = 61 |:2

x = 30,5

13x-2=5x-66

13x-5x = -66 + 2

8x = -64 |:8

x = -8

2(x-2)=6x+24

2x - 4 = 6x + 24

2x - 6x = 24 +4

-4x = 28 | : (-4)

x = -7

(x-2)(x+2)=x²-2x

x²-4 = x²-2x

x² - x² -4 = -2x

-4 = -2x

-2x = -4 |:(-2)

x = 2