distribute first. gets you 10y+100y X 4 then add 10y + 100y which os 110y... so the end equation would be 110y X 4
Use the distributive property to multiply. The distributive property says that 2y(5+50y) is equal to 2y(5) + 2y(50y). With that, you solve. You will come up with 4(10y+100y^2). You then use the distributive property again, such that 4(10y) + 4(100y^2) equals 4(10y+100y^2). Solve. You will come up with 400y² + 40y. That is your final answer. I hope this clears things up for you so that you get how to solve these kinds of problems!