(9m-8n)^2-(8n+9m)^2 разложить ** множители

Question

(9m-8n)^2-(8n+9m)^2 разложить на множители

Answer 1

(9m-8n)^2-(8n+9m)^2=81m^2-144mn+64n^2-(64n^2+144mn+81m^2)=81m^2-144mn+64n^2-64n^2-144mn-81m^2= -288mn