2,95
Объяснение:
(5x+2)²-(5x-3)(5x+3)=72
25 + 20x + 4 - (25 - 9) = 72
25 + 20x + 4 - 25 + 9 = 72
20x + 13 = 72
20x = 72- 13
20x = 59
x = или 2,95
2,95
Объяснение:
(5x+2)²-(5x-3)(5x+3)=72
25 + 20x + 4 - (25 - 9) = 72
25 + 20x + 4 - 25 + 9 = 72
20x + 13 = 72
20x = 72- 13
20x = 59
x = или 2,95