Question

Factorise:a^2-81 (b-c)^2​

Answer 1

Step-by-step explanation:

Factorise:a^2-81 (b-c)^2

Factorise:a^2-81 (b-c)^2

Factorise:a^2-81 (b-c)^2

Answer 2

Answer:

Step-by-step explanation:

a$a^{2} -81(b-c)^{2}$  

$using \\a^2-b^{2} = (a+b)(a-b)$

$=[a+9(b-c)][a-9(b-c)]\\=(a+9b-9c)(a-9b+9c)$