Question

Resolvendo a equaçao x²-5x
-------------------- = 0 obtemos:
x(x²-25)

Answer 1

$\dfrac{x^2 - 5x}{x(x^2 - 25)} \\ \\ \\ \dfrac{x(x - 5)}{x(x - 5)(x + 5)} \\ \\ \\ \dfrac{\not x(x\not - 5)}{\not x(x \not - 5)(x + 5)} \\ \\ \\ => \dfrac{1}{x + 5}$