(5n-3)^2 - (5n+2)(5n-2) = -47(25n^2 - 30n + 9) - (25n^2 - 4) = -4725n^2 - 30n + 9 - 25n^2 + 4 = -47-30n + 13 = -47-30n = -60n = 2
Ответ: n = 2.
(5n-3)^2 - (5n+2)(5n-2) = -47
(25n^2 - 30n + 9) - (25n^2 - 4) = -47
25n^2 - 30n + 9 - 25n^2 + 4 = -47
-30n + 13 = -47
-30n = -60
n = 2
Ответ: n = 2.