Question

Решите пример 25b^2-(b-5)^2

Answer 1

$25 b^{2} -(b-5)^{2}=(5b)^{2}-(b-5)^{2} =(5b-(b-5))(5b+(b-5))=$
$=(5b-b+5)(5b+b-5)=(4b+5)(6b-5)$