Question

Which of the following is the product of the rational expressions shown below?

x 2x
--------- * -----------
x - 5 x + 4

Answer 1

$\frac{x}{x-5} * \frac{2x}{x+4}$
$\frac{2x^{2} }{(x-5)(x+4)}$               (distribute out the bottom)
$\frac{2 x^{2} }{ x^{2} + 4x-5x-20}$  
$\frac{2 x^{2} }{ x^{2} -1x-20}$         (this is your answer)