Question 522507
Simplify:
1) {{{(x^2-9x+20)/(20-5x)}}} Factor the numerator and the denominator.
{{{(x-4)(x-5)/5(4-x)}}} Rewrite the denominator.
{{{cross((x-4))(x-5)/(-5*cross((x-4)))}}} Cancel the indicated factors to get:
{{{(x-5)/-5}}}
2) {{{(4x^3+4)/(x^2-1)}}} Factor the numerator and the denominator.
{{{4(x^3+1)/((x-1)(x+1))}}} Factor the sum of cubes in the numerator.
{{{4*cross((x+1))(x^2-x+1)/(x-1)cross((x+1))}}} Cancel the indicated factors.
{{{4(x^2-x+1)/(x-1)}}}