(5x -10) ² - (-x + 10) ² = -6 (2x -1) ( 7- 2x) -10
Risultato 2
(5x -10) ² - (-x + 10) ² = -6 (2x -1) ( 7- 2x) -10
Risultato 2
(5x -10) ² - (-x + 10) ² = -6 (2x -1) ( 7- 2x) -10
25x^2 +100-100x - (x^2+100-20x) = -6(14x-7-4x^2+2x)-10
25x^2 +100-100x-x^2-100+20x=-84x+42+24x^2-12x-10
16x=32
x=32/16
x=2