Question

номер 3 ток надо...............................................

Answer 1

(3a -a²)² - a²(a - 2)(a +2) + 2a(7 + 3a²) = 9a² - 6a³ + a⁴ - a²(a² -4) + 14a + 6a³ =

= 9a² + a⁴ - a⁴ + 4a² + 14a = 13a² +14a

Answer 2

$(3a-a^2)^2-a^2(a-2)(a+2)+2a(7+3a^2)=\\(9a^2-6a^3+a^4)-(a^2(a^2-4))+(14a+6a^3)=\\9a^2-6a^3+a^4-a^4+4a^2+14a+6a^3=13a^2+14a$