Question

factorise 9a^2 + 4b ^2 - 12ab - 25c^2

Answer 1

Answer:

(3a-2b+5c)(3a-2b-5c)

Step-by-step explanation:

(3a-2b)^2 - (5c)^2

now applying a^2 - b^2 = (a+b) (a-b)

= (3a-2b+5c)(3a-2b-5c)