How does 5 * (2 *a - 6*b^2) become 10 * a - 30 * b^2? I am doing revision as I have my first class of Quantitative Analysis for Business. All the maths I am fine with but Distributive Property of Multiplication. This is really making me nervous because getting a tutor through the Uni is impossible. I think it is something really simple if I could just find how this problem is solved. Thank you if you can help. ps Does anyone know of any web sites that might be of help. I have not looked yet.