Question

14(x-3y)^3 -21a(x-3y)​

Answer 1

Answer:

7 (x-3y)[2x²+18y²-12xy-3a]

Step-by-step explanation:

Given that ;

14(x-3y)³-21a(x-3y)

=7 (x-3y)[2(x-3y)²-3a]

But we know that;

(a-b)² = a²+b²-2ab

=7 (x-3y)[2(x²+9y²-6xy)-3a]

=7 (x-3y)[2x²+18y²-12xy-3a]

This is required simpleyfied answer .