Lorian Posted January 28, 2006 Report Share Posted January 28, 2006 Am doing maths coursework and am trying to figure out how to multiply out these brackets:(0.5n+0.5)(n+2)If n is 3 then I should get 10, but if I attempt to multiply out the brackets I get 20...0.5 * n = 0.5n0.5 * 2 = 1n * n = n2n * 2 = 2n0.5 * n = 0.5n0.5 * 2 = 11.5 + 1 + 9 + 6 + 1.5 + 1 = 20Where am I going wrong? Cheers Quote Link to comment Share on other sites More sharing options...
Argalius Posted January 28, 2006 Report Share Posted January 28, 2006 (edited) (0.5n+0.5)(n+2)is the same as:(0.5n+0.5)*n + (0.5n+0.5)*2Then you'll get:0.5n^2 + 0.5n + n + 1is:0.5n^2 + 1.5n + 1When you put in 3:0.5*3^2 = 4.51.5*3 = 4.5+ 1= 10EDIT: I'm not sure where you went wrong, but I think it's because you divided up 0.5n into 0.5 and n. But it's pretty hard to do it on a PC... Edited January 28, 2006 by Argalius Quote Link to comment Share on other sites More sharing options...
Lorian Posted January 28, 2006 Author Report Share Posted January 28, 2006 Thanks a lot Arg, been trying to figure that out all morning Quote Link to comment Share on other sites More sharing options...
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