Question

factorize: 9m^4-24m^2n^2+16n^4-256​

Answer 1

=(3m²-4n²)²-256

=(3m²-4n²)²-(±16²)

=(3m²-4n²)(3m²+4n²)±16²

=(3m²-4n²-16)(3m²+4n²+16)

*factors based on (a²-b²)=(a-b)(a+b) formula.