Question

(2x+5y) в квадрате?????????????

Answer 1

(2х+5у)²=4х²+20ху+25у²

Answer 2

(x + y)^2 = x^2 + 2xy + y^2 "^2" - в квадрате (2x+5y)^2 = 4x^2+20xy+25y^2