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i have tried this but i just cant see how it can be done
make u the subject of the formula d=ut+kt²
i figured that you could use substitution but i dont know how to go about it.
please help
thanks
I'm pretty sure this is right:
Last edited by Daniel123 (2007-06-05 06:48:02)
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thanks man, that really helps.
No problem! You just need to remember that when you have a rearranging question that has two terms with the same letter on the same side of the equation, then you factorise, e.g.:
ut + kt² (the common letter is the 't', so you take the 't' out by factorising)
t (u+kt)
then you just need to move the 't' you have taken out to the other side, as well as the kt.
Last edited by Daniel123 (2007-06-05 07:13:24)
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you could also do it this way: the way i would generally do it:
the only time you need to factorise is when the term you're trying to single out is in more than one term like:
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The End Of All Things To Come.
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the only time you need to factorise is when the term you're trying to single out is in more than one term like:
That's what I attempted to say, but I couldn't put it into words that anyone other than me would understand... although I'm not quite A level standard though
Last edited by Daniel123 (2007-06-05 07:28:43)
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I'd have also solved it luca's way.
Generally, the way to do these is to first put all terms containing the subject on one side and all term that don't on the other, then factorise out the subject and divide through by what you get left.
The only ones that can't be solved like that are those that have different orders of the subject, such as t in the original example. In those cases, completing the square is normally the way to go (or the quadratic equation if you're lazy ).
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It wanted to be normal.
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