aku now in e-cafe satok...dont know what to say, everything i do seems useless...i cannot focus my mind on certain matters...all i think is about tomorrow..going to kl for the induction thing...aku x ready sebenarnya..haha, bukan x ready ape...its just that im jealous with my frens who had their holiday much2 longer than me...my holiday is cut to half...bcoz of the PLKN thing..but i dont regret at all...hihi, i get very precious xperience there...although i had my holiday shorter than lots of my frens....neway, i cant bluffing here, as i can get into campus later than everyone else...at least 10 people are later than me i think...jpa, mara, n petronas guys...hihi, thank Allah that im a scholar...i wouldnt burden my parents heavy2 sgt...pas ni abah will pick me up at 6.30...so im spending masa skit dari buang mase tgk org main ps kan...haha...tadi g gunting rambut jap....ok chiawz!!
p/s: x sabar nak balik belajar semula...nak beratkan kpale..
Here are the graphs of two slightly more complicated equations, a parabola (y=x²) and a hyperbola (y=1/x). We dealt with these in algebra. But, they caused us some problems, which you may not have noticed. It is difficult, using only algebra, to find the slope of these curves (at any given point). Why would we want to complicate our lives by finding the slope of a curve? Well, it is absolutely vital in physics and engineering. It is even of some interest to a skier.
This graph shows us something about functions (a function is a special kind of equation). This could be a graph of the equation x=y² (y=x² turned on its side). But such an equation is awkward for some uses. Using sqr() for the square root function (since my choice of symbols is limited), y=± sqr(x) is what we get, when we solve for y. For most values of x, we get two values of y. This is perfectly acceptible in analytic geometry. But there are situations where it is much simpler to have only one value of y, y=+ sqr(x). Such an equation is called a function. A function is like a machine in which you plug in an x and out pops a y (and only one y). If I had turned the y=x² graph on its side, I would end up with a graph of two functions, y=+ sqr(x) and y=- sqr(x), just as I can graph two straight lines on the same graph. Instead, I only graphed y=+ sqr(x), which is a function. In fact, when we write y=sqr(x), we mean the positive square root. If we want both positive and negative, we write y=± sqr(x).
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