little maths help

mufc802 · 10 Sep 2011 at 21:33

How do you do this?

That is the answer just not sure how you do that process.

jon86 · 10 Sep 2011 at 21:39

root (49/4 + (49*4)/4) =
root (5 * 49/4) =
root 5 * root (49/4) =
7/2 * root 5

Subliminal Aura · 10 Sep 2011 at 21:45

Square both sides and it all becomes clear
(49/4) + 49 = (7*7/2*2) * 5

Amleto · 10 Sep 2011 at 21:52

get everything inside sqrt into common denominator:

49/4 + 49 = 49/4 + 49*4/4
=(49 + 49*4)/4

so sqrt(49/4 + 49) = sqrt((49 + 49*4)/4)

=sqrt(7*7(1+4)/(2*2))
= 7/2 * sqrt(1+4)

mufc802 · 10 Sep 2011 at 21:58

I'm just not getting it.. Probably missing the obvious..

So I do SQRT(49/4 + 196/4) now what?

Mason- · 10 Sep 2011 at 22:00

Just square both sides, gets rid of the roots?

mufc802 · 10 Sep 2011 at 22:33

I think I see it now, the 49/4 and 196/4 is just 245/4 and divide the 245 by 49 makes 5. So now I have SQRT(5 * 49/4) so I can simplify the 49/4 and leave the 5 as it is to make 7/2 SQRT(5).

Amleto · 10 Sep 2011 at 23:10

do it may way to see everything best imo. no need calculate any multiplication at all.

Shayper · 10 Sep 2011 at 23:12

As said, square both sides.

I wish my maths degree was this easy

Killerkebab · 10 Sep 2011 at 23:27

DON'T SQUARE BOTH SIDES, that isn't teaching you anything.

titaniumx3 · 10 Sep 2011 at 23:37

Darg · 11 Sep 2011 at 00:23

Thankyou Titanium, trying to understand maths written in text is far too hard!

Amleto · 11 Sep 2011 at 00:50

titanium just piccified what I wrote, basically