Chapter 5 - Section 5.3 - Special Products - Exercise Set - Page 367: 9

$10x^2-9x-9$

Using $(a+b)(c+d)=ab+ad+bc+bd$ or the FOIL Method, the product of the given expression, $ (2x-3)(5x+3) ,$ is \begin{array}{l}\require{cancel} 2x(5x)+2x(3)-3(5x)-3(3) \\\\= 10x^2+6x-15x-9 \\\\= 10x^2-9x-9 .\end{array}