Question

разложите на множители (5c-3d)^2-9d^2

Answer 1

(5c-3d)² - 9d² = (5c - 3d)² - (3d)² = 
= (5c - 3d - 3d) * (5c - 3d + 3d) =
= (5c - 6d) * 5c 

Answer 2

$(5c-3d ^{2} )-9d ^{2} =(5c-3d-3d)(5c-3d+3d)=(5c-6d)*5c=\=5c(5c-6d)$