Question

Возведите в квадрат (3b-2c)^2

Answer 1

(3b-2c)^2=9b^2-12bc+4c^2

Answer 2

$(3b-2c)^2 \\ x=3b \\ y=2c \\ (x-y)^2=x^2-2xy+y^2 \\ (3b-2c)^2=9b^2-2*3b*2c+4c^2=9b^2-12bc+4c^2$