Me with these two questions. and can you tell me how to do this! you

(X-10)(X-10) You need to first multiply out the brackets. So, first times X by X, which makes x^2 . Then do -10 x -10 which makes 100. You then need to multiply the X within the first bracket with the minus 10 in the second bracket which makes -10x. Do the same but with the -10 from the first bracket and the X from the second which again makes -10x. So altogether you have x^2-10x-10x+100. This can be simplified down to x^2-20x+100. You then do the same thing for the second question :)

(x-10)(x-10) = (x-10)^2 so in this case just you need to know formula of 

(a-b)^2 = a^2 -2ab +b^2

use please this and so will get the right answer sure