## Introductory Algebra for College Students (7th Edition)

$x^3+4x^2+5x+20$
Using $(a+b)(c+d)=ab+ad+bc+bd$ or the FOIL Method, the product of the given expression, $(x+4)(x^2+5) ,$ is \begin{array}{l}\require{cancel} x(x^2)+x(5)+4(x^2)+4(5) \\\\= x^3+5x+4x^2+20 \\\\= x^3+4x^2+5x+20 .\end{array}