Question

2b деленная на b^2 - 9b.
7х-7у деленная на х^2 - у^2

Answer 1

$frac{2b}{b^2-9b}= frac{2b}{b(b-9)}= frac{2}{b-9} \ frac{7x-7y}{x^2-y^2}= frac{7(x-y)}{(x-y)(x+y)}= frac{7}{x+y}$