Question

25a² - 9b² + 12bc - 4c²​

Answer 1

25a^2-9b^2+12bc-4c^2

=>25a^2-(9b^2-12bc-4c^2)

=>25a^2-(3b-4)^2

(a-b)^2= a^2+b^2-2ab

=>(5a+3b-4c)(5a-3b+4c) (a+b)(a-b)=a^2-b^2

:.(5a+3b-4c)(5a-3b+4c)