The Student Room Group
Competition - post a photo you've taken of nature >>
Competition - post a photo you've taken of nature >>
Competition - post a photo you've taken of nature >>

Maths year 11

Scroll to see replies

Reply 320
Avatar for z_o_e
z_o_e
OP
11
Original post by 34908seikj
Use pythagorus

x2+(2x)2=25 \sqrt{x^2 + (2x)^2} = 25


x2+4x2=25 \sqrt{x^2 + 4x^2} = 25


On my phone :frown:( came out in latex

Posted from TSR Mobile
Original post by z_o_e
On my phone :frown:( came out in latex

Posted from TSR Mobile


Sorry Will fix it now.
Original post by 34908seikj
Use pythagorus


*Pythagoras.
Reply 323
Avatar for z_o_e
z_o_e
OP
11
Original post by 34908seikj
Sorry Will fix it now.


I did this now as well :smile:

I think it's right.



Posted from TSR Mobile
1469181762720.jpg29.5KB
Original post by B_9710
*Pythagoras.


Sorry babe

Original post by z_o_e
On my phone :frown:( came out in latex

Posted from TSR Mobile

Try and finish it from here

Spoiler

Original post by z_o_e


a=x, b=2x. Just plug this in and find c.
Original post by z_o_e
I did this now as well :smile:

I think it's right.



Posted from TSR Mobile


I got 8.5, but what you did was right.
Reply 327
Avatar for z_o_e
z_o_e
OP
11
Original post by 34908seikj
I got 8.5, but what you did was right.


I just don't get this!
Never did this before.



Posted from TSR Mobile
1469182096200.jpg28.2KB
Reply 328
Avatar for z_o_e
z_o_e
OP
11
Original post by 34908seikj
I got 8.5, but what you did was right.


Got this!!



Posted from TSR Mobile
1469182425217.jpg26.4KB
Original post by z_o_e
I just don't get this!
Never did this before.



Posted from TSR Mobile


Okay, split it up.


You have √5 * √x^2 = 25

The √x^2 cancel out which leaves you with x

Now you have x√5 = 25

Divide by √5 and rationalise the denominator


So it will be x = 25/√5 -----> x = 25√5/5

Which leaves you with x = 5√5
Original post by z_o_e


You would still have x√5 not 5x since you can rewrite it as √5 * √x^2 = 25


Now the square cancels out the square root so you are left with √5 * x = 25


Which is the same as x√5 = 25
Original post by 34908seikj
I got 8.5, but what you did was right.


My answer from yesterday gives 8.56...
Original post by B_9710
My answer from yesterday gives 8.56...

Spoiler

Reply 333
Avatar for z_o_e
z_o_e
OP
11
Original post by 34908seikj
You would still have x√5 not 5x since you can rewrite it as √5 * √x^2 = 25


Now the square cancels out the square root so you are left with √5 * x = 25


Which is the same as x√5 = 25


Can you do this question from scratch please :frown: feel so bad asking you again.

But I don't understand the last square root stuff.

Then I'll do a similar question to this ":smile:

Posted from TSR Mobile
Original post by z_o_e
Can you do this question from scratch please :frown: feel so bad asking you again.

But I don't understand the last square root stuff.

Then I'll do a similar question to this ":smile:

Posted from TSR Mobile

x2+(2x)2=252 x^2 + (2x)^2 = 25^2 .
5x2=252 5x^2= 25^2 so
x2=125 x^2=125 so x=125=55cm x= \sqrt{125}= 5\sqrt 5 \text{cm} .
Original post by z_o_e
Can you do this question from scratch please :frown: feel so bad asking you again.

But I don't understand the last square root stuff.

Then I'll do a similar question to this ":smile:

Posted from TSR Mobile

Spoiler

Reply 336
Avatar for z_o_e
z_o_e
OP
11
Original post by 34908seikj

Spoiler



Too hard :frown:(
I think I should leave this question.

I don't understand surds and squares maybe I need to learn them in order to understand this?
Original post by z_o_e
Too hard :frown:(
I think I should leave this question.

I don't understand surds and squares maybe I need to learn them in order to understand this?


Yes. Surds are super simple once you get the hang of them.
Reply 338
Avatar for z_o_e
z_o_e
OP
11
Original post by 34908seikj
Yes. Surds are super simple once you get the hang of them.


I need an introduction haha I know a bit of this :smile:
:awesome:
1469186975632.jpg15.0KB
1469186982046.jpg10.8KB
Original post by z_o_e
I need an introduction haha I know a bit of this :smile:
:awesome:


There are very simple rules you need to follow to answer all of these questions.
a×b=ab \sqrt a \times \sqrt b = \sqrt{ab} and also
ab=ab \displaystyle \frac{\sqrt a}{\sqrt b }= \sqrt{\frac{a}{b}} .

Quick Reply

Related discussions

Latest

Trending

Trending

Articles for you