factor out the greatest common factor from the expression

Question

6x^3yz^4-3x^2y^3z^4-18^4y^2z^3

Answer 1

Assuming you meant

6x^3yz^4 - 3x^2y^3z^4 - 18x^4y^2z^3,

3x^2yz^3(2xz- y^2z - 6x^2y)