Question

Упрости выражение
3х-4)^2+(2х-4)(2х+4) +65х=
при х=3

Answer 1

= 9x^{2} - 24x + 16 + 4x^{2} - 16 + 65x = 13x^{2} + 41x = x(13x + 41) \\ x = 3 \\ 3(13 × 3 + 41) = 240