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weeeee's avatar

Simple question on rearranging formulas?

Asked by weeeee (62points) April 8th, 2010

When we times three numbers together E,G, r=xyz can we bring any of the xyz over to the other side and just put it underneath? r/z.

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5 Answers

lilikoi's avatar

Yes. If you divide both sides by z, then you get r/z = xy since z/z = 1. Similarly, r/x = yz.

weeeee's avatar

@lilikoi
Um I thought so but my equation doesn’t seem to be right.
D=½at^2

D: distance
A: gravity 9.8
T: time

I need to work out time so I did the square root of (½)xa-d only to get the wrong answer, the answer should be 0.63.

lilikoi's avatar

Isolate t first.

(2 D) / a = t^2

Then take the square root.

sqrt ( 2D/a) = t

lilikoi's avatar

Whatever you are solving for, always try to isolate it first one one side by itself.

weeeee's avatar

@lilikoi
Doh, ignore me I have no good reason why I couldn’t have worked that out, thanks.

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