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Nanny needing help with Maths question

10 replies

ClaygateNanny123 · 19/08/2016 13:57

This is probably not the best place to post but could anyone help me work out x/4 = 49/x. I know the answer but not how to work out

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Ninjapie · 19/08/2016 14:05

If you rearrange you get x squared = 49/4
Take square root
X=7/2
Or x=3.5

ClaygateNanny123 · 19/08/2016 16:10

Thank you and sorry to be a pain it would you mind talking me through the rearranging

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LemonRedwood · 19/08/2016 16:14

Isn't it x squared = 49*4?

thecapitalsunited · 19/08/2016 16:15

Times both sides to get
(x^2)/4=49
Then times both sides by 4
x^2=494
Here is where you can be clever and realise that both are square numbers and we can get to
x=7
2=14

thecapitalsunited · 19/08/2016 16:16

Because 494=7722=(7*2)^2

LemonRedwood · 19/08/2016 16:19

Clay When you move a term to the other side of the equals sign, you do the opposite operation, as you are "undoing" that thing to both sides to maintain the equality.

You want all the xs on one side and all the numbers on the other. So, move the /4 to the other side and thus becomes x=49/x 4. Then move the /x so you get xx=494.
x
x=196 so x=14

dementedpixie · 19/08/2016 16:25

I get x (squared) = 49x4 so x = square root of 196 so x= 14

dementedpixie · 19/08/2016 16:33

This is how I would do it

Nanny needing help with Maths question
ClaygateNanny123 · 19/08/2016 17:37

Thank you everyone I understand now - have done it over 20 years ago but forgotten

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ReturnfromtheStars · 19/08/2016 21:33

Don't forget that it can also be -14, as there are two solutions for the square root of 196: 14 and -14.

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