Question

РЕШИТЕ ПЖ отдаю 15 балов

Answer 1

$0.16x^8-1.2x^4y+2.25y^2=(0.4x^4)^2-1.2x^4y+(1.5y)^2= \\ =(0.4x^4-1.5y)^2 \\ \\ \\ 196n^2+84n+9 = (14n+3)^2$