Question

factorise : a² - b² - 10bc - 25c²​

Answer 1

Step-by-step explanation:

a^2-(b^2+2b(5c)+(5c)^2)

a^2-(b+5c)^2

(a-b-5c)(a+b+5c)

Answer 2

i have answered your query again in that question you can see it.

hope it helps