Algebraic Techniques, SM-Bank 155 Fully factorise \(2mn^2+6m^2n-8mn\). (2 marks) Show Answers Only \(2mn(n+3m-4)\) Show Worked Solution \(2mn^2+6m^2n-8mn\) \(=2mn\times n+2mn\times 3m+2mn\times (-4)\ \ \ \ (\text{HCF}=2mn)\) \(=2mn(n+3m-4)\)