Algebra: A Combined Approach (4th Edition)

$\frac{x^{2}+3x}{20}$ is correct. $\frac{2x+3}{20}$ is false.
$\frac{x}{5}$ * $\frac{x+3}{4}$=$\frac{x(x+3)}{5*4}$= $\frac{x^{2}+3x}{20}$ is correct. $\frac{2x+3}{20}$ is false.