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 Umm... I meant multiply? [Quote] [Link]
 Yeah, it's clearer if you use *. In further math, you get variable introduced, and using x looks like one. [Quote] [Link]
 I also like to use spaces between values and operators, but that's partly just preference. [Quote] [Link]
 Well probably ^ But bare in mind we've only just started year 8. We started 7th September. [Quote] [Link]
 Poland: year 7=algebra, so if that's the case, just starting 8th (as I am) is no excuse. [Quote] [Link]
 That's hardly fair. Different countries have different curriculum. Different school's have different curriculum. My brothers' school taught them stuff in yr 7 that I wasn't taught then. [Quote] [Link]
 of course, but then, I was referring more to it not being much of an excuse here. [Quote] [Link]
 We did stuff like 3x + 4x = 7x and how x was more like two c's [Quote] [Link]
 They're saying to use * instead of x when typing, though because it gets confusing. I usually just use brackets rather than a multiplication sign, anyway. [Quote] [Link]
 eofpi Administrator656 Posts11 Cresco 13:3 - 13.5.25615.444 days ago Brackets can be misleading: to some of us, they suggest vectors. [Quote] [Link]
 I assume Liv meant parenthesis. (8)(5)=40 [Quote] [Link]
 eofpi Administrator656 Posts11 Cresco 13:3 - 13.79.0615.407 days ago That crossed my mind too. Implied multiplication with parentheses can be misleading too, though: is f(x) "f times x" or "f of x"? The result of all this is that there's no single absolutely unambiguous way to express multiplication. It seems to me that the most widely understood ways are * and parentheses, with care taken to avoid the ambiguous circumstances surrounding each. [Quote] [Link]
 Hydrogen777 Administrator5453 Posts11 Cresco 13:3 - 17.21.60615.236 days ago If f is known to be a function and not a number, then f(x) = fx. Edit: By that I mean, a function is never really multiplied by a number, but a similar notation for multiplication is valid for applying functions to elements of a set. [Quote] [Link]
 So, in my calc book there's a notation of a function written as:      [4-x,  x!=2 f(x)=[      [0,    x=2 Except imagine that the square brackets are one big curly bracket. What does this notation mean? I skipped precalc, so I assume this is one of those things I missed out on. [Quote] [Link]
 For all values that are not X = 2, y = 4 - x. For value of X = 2, y = 0. Basically it's a y = 4 - X graph with an exception at value X = 2. Example. f(x) = [-1 if x < 0 ] [15 if x = 0 ] [ 1 if x > 0 ] Basically this says from the interval (-âˆž,0) the y value is -1. At x = 0 the y value is 15. From the interval (0,âˆž) the y value is 1. [Quote] [Link]