-2a(a+b)+b(a+b)

-2a(a+b)+b(a+b)


solution
-2a(a+b)+b(a+b)
=(a + b) (b-2a) - extract the common factor (a + b)



16a^2b-16a^3-4ab^2


16a^2b-16a^3-4ab^2
=-4a(4a²-4ab+b²)
=-4a(2a-b)²



Factorization (a-2b) ^ 2-16a ^ 2