Question

-71a^3b-84a^4b+50a^3b+84a^4b^2-45a^3b+18a^3b

Answer 1

$-71a^3b-84a^4b+50a^3b+84a^4b^2-45a^3b+18a^3b$
$\mathrm{Agrupar\:terminos\:semejantes}:$
$=-84a^4b+84a^4b^2-71a^3b+50a^3b+18a^3b-45a^3b$
$=-84a^4b+84a^4b^2-48a^3b$