Question

Please answer the question.
Find the degree of the polynomial
How is the multiplication done
$(x {}^{3} + 5)(4 - x { }^{5} )$

Answer 1

$( {x}^{3} + 5)(4 - {x}^{5} ) = {x}^{3} (4 - {x}^{5} ) + 5(4 - {x}^{5} )$
that is
$- {x}^{15} - 5 {x}^{5} + 4 {x}^{3} + 20$
degree is 15