Chapter 5 - Section 5.3 - Special Products - Exercise Set - Page 367: 14

$2-3x-20x^2$

Using $(a+b)(c+d)=ab+ad+bc+bd$ or the FOIL Method, the product of the given expression, $ (2+5x)(1-4x) ,$ is \begin{array}{l}\require{cancel} 2(1)+2(-4x)+5x(1)+5x(-4x) \\\\= 2-8x+5x-20x^2 \\\\= 2-3x-20x^2 .\end{array}