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Mathematics 14 Online
OpenStudy (vshiroky):

@ikram002p

OpenStudy (vshiroky):

OpenStudy (ikram002p):

|dw:1396133285068:dw|

OpenStudy (vshiroky):

Now what?

OpenStudy (ikram002p):

do u know where this formula come from ? its from phythatgorus 24^2 = x^2 + x^2 right ?

OpenStudy (ikram002p):

so 2x^2 - 24 ^2 =0

OpenStudy (ikram002p):

\(\Huge (\sqrt2 x - 24) (\sqrt2 x + 24)=0 \) right ?

OpenStudy (vshiroky):

Then distribute?

OpenStudy (vshiroky):

Huh

OpenStudy (ikram002p):

no just take \(\Huge \sqrt2 x - 24) =0 \) and \(\Huge \sqrt2 x + 24) =0 \) ( but this one ignore it since it gives u negative length)

OpenStudy (vshiroky):

I don't know what you mean by just take that?

OpenStudy (ikram002p):

ohh u have this quadratic equation \(\Huge 2x^2-24^2=0\) how would u solve it ?

OpenStudy (vshiroky):

square -24

OpenStudy (vshiroky):

2x^2-576

OpenStudy (vshiroky):

2x^2=576.. divide by 2? the square root?

OpenStudy (vshiroky):

16.97

OpenStudy (ikram002p):

yeah u right ! u got it !

OpenStudy (vshiroky):

So would I write sqrt288 or 16.97 as my answer?

OpenStudy (vshiroky):

@ikram002p

OpenStudy (ikram002p):

it says radical so let it sqrt288 but simplify it can u do that ?

jimthompson5910 (jim_thompson5910):

|dw:1396133967521:dw| \[\Large a^2 + b^2 = c^2\] \[\Large x^2 + x^2 = 24^2\] \[\Large 2x^2 = 24^2\] \[\Large 2x^2 = 576\] \[\Large x^2 = \frac{576}{2}\] \[\Large x^2 = 288\] \[\Large x = \sqrt{288}\] \[\Large x = \sqrt{144*2}\] \[\Large x = \sqrt{144}*\sqrt{2}\] \[\Large x = 12*\sqrt{2} \ ... \ \text{Exact Answer}\] \[\Large x \approx 16.97 \ ... \ \text{Approximate Answer}\]

OpenStudy (vshiroky):

12*sqrt2 is what I would put?

OpenStudy (ikram002p):

@jim_thompson5910 she need it radical

OpenStudy (ikram002p):

yeah ur correct @vshiroky !

jimthompson5910 (jim_thompson5910):

ok so ignore the last line of my steps

jimthompson5910 (jim_thompson5910):

hopefully you see how I simplified that radical

OpenStudy (vshiroky):

do I have to put the * sign? of just 12sqrt2

jimthompson5910 (jim_thompson5910):

\[\Large 12\sqrt{2}\] works too

jimthompson5910 (jim_thompson5910):

since the 12 near the root implies multiplication

OpenStudy (vshiroky):

OpenStudy (vshiroky):

Can you help with this jim? I'm running out of time on my homework, i spent too long on that last one

OpenStudy (vshiroky):

@jim_thompson5910

jimthompson5910 (jim_thompson5910):

again we'll use the pythagorean theorem \[\Large a^2 + b^2 = c^2\] \[\Large 3^2 + (\sqrt{55})^2 = c^2\] \[\Large 9 + 55 = c^2\] \[\Large 64 = c^2\] \[\Large c^2 = 64\] \[\Large c = \sqrt{64}\] \[\Large c = 8\]

OpenStudy (vshiroky):

So the first is sqrt64 and the second is 8?

OpenStudy (vshiroky):

Can I post more here @jim_thompson5910

jimthompson5910 (jim_thompson5910):

no they are both 8 since 8 is an exact answer and because it's a whole number, there's no real need to have an approximate answer

jimthompson5910 (jim_thompson5910):

but that box is there if you happened to get something like 8.23 or something

jimthompson5910 (jim_thompson5910):

how many more do you have?

OpenStudy (vshiroky):

OpenStudy (vshiroky):

Is that right? I have a few still

jimthompson5910 (jim_thompson5910):

good, the punctation in there may need to be removed though (depending on how picky the computer is)

jimthompson5910 (jim_thompson5910):

punctuation*

OpenStudy (vshiroky):

jimthompson5910 (jim_thompson5910):

were you able to get anywhere?

OpenStudy (vshiroky):

No cause it has 4a that confuses me

jimthompson5910 (jim_thompson5910):

\[\Large a^2 + b^2 = c^2\] \[\Large a^2 + (4a)^2 = 9^2\] \[\Large a^2 + 16a^2 = 81\] how about now?

OpenStudy (vshiroky):

Still no

jimthompson5910 (jim_thompson5910):

ok I'll keep going

jimthompson5910 (jim_thompson5910):

\[\Large a^2 + 16a^2 = 81\] \[\Large 17a^2 = 81\] \[\Large a^2 = \frac{81}{17}\] \[\Large a = \sqrt{\frac{81}{17}}\] \[\Large a = \frac{\sqrt{81}}{\sqrt{17}}\] \[\Large a = \frac{9}{\sqrt{17}}\] \[\Large a = \frac{9*\sqrt{17}}{\sqrt{17}*\sqrt{17}}\] \[\Large a = \frac{9*\sqrt{17}}{\sqrt{17*17}}\] \[\Large a = \frac{9*\sqrt{17}}{\sqrt{17^2}}\] \[\Large a = \frac{9\sqrt{17}}{17}\]

jimthompson5910 (jim_thompson5910):

if \[\Large a = \frac{9\sqrt{17}}{17}\] then \[\Large b = 4a\] \[\Large b = 4*\frac{9\sqrt{17}}{17}\] \[\Large b = \frac{4*9\sqrt{17}}{17}\] \[\Large b = \frac{36\sqrt{17}}{17}\]

OpenStudy (vshiroky):

jimthompson5910 (jim_thompson5910):

get anywhere?

OpenStudy (vshiroky):

No I think I'm just stressed cause I am running out of time

jimthompson5910 (jim_thompson5910):

well you have to check to see if a^2 + b^2 = c^2 is true

jimthompson5910 (jim_thompson5910):

c is always the longest side

jimthompson5910 (jim_thompson5910):

if a^2 + b^2 = c^2 is true, then the triangle is a right triangle

OpenStudy (vshiroky):

I got 576+49=625

jimthompson5910 (jim_thompson5910):

so is 24^2 + 7^2 = 25^2?

jimthompson5910 (jim_thompson5910):

the left side turns into 625, so we have 625 = 625

OpenStudy (vshiroky):

So not a right angle and 625?

jimthompson5910 (jim_thompson5910):

making 24^2 + 7^2 = 25^2 true

jimthompson5910 (jim_thompson5910):

so we definitely have a right triangle

OpenStudy (vshiroky):

Ok and 625 is the next answer?

jimthompson5910 (jim_thompson5910):

c is always the longest side c is the hypotenuse

jimthompson5910 (jim_thompson5910):

not c^2

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