You distribute the 30x to the equation in parenthesis So basically you are doing (30x*x)+(30x*-3) So you get 30x^2-90x Hope this helps!

30x(x-3) lets substitute x for 1 30 * 1(1 - 3) 1 - 3 = 2 30 * 1 = 30 30 * 2 = 60 I hope I did it correctly.