Odpowiedź :
Odpowiedź:
(x + 2)² + (x - 4)² = 2(x + 5)(x - 5) + 2(3x - 1)
x² + 4x + 4 + x² - 8x + 16 = 2(x² - 25) + 6x - 2
2x² - 4x + 20 = 2x² - 50 + 6x - 2
2x² - 2x² - 4x - 6x = - 52 - 20
- 10x = - 72
10x = 72
x = 72/10 = 7,2
Odpowiedź:
(x + 2)² + (x - 4)² = 2(x + 5)(x - 5) + 2(3x - 1)
x² + 4x + 4 + x² - 8x + 16 = 2(x² - 25) + 6x - 2
2x² - 4x + 20 = 2x² - 50 + 6x - 2
2x² - 2x² - 4x - 6x = - 52 - 20
- 10x = - 72
10x = 72
x = 72/10 = 7,2