(-5a^2 + 2a + 3)*(4a^2 - a + 1) решите

Question

(-5a^2 + 2a + 3)*(4a^2 - a + 1) решите

Answer 1

-20a^4+5a^3-5a^2+8a^3-2a^2+2a+12a^2-3a+3=-20a^4+13a^3+5a^2+5a+3