+0  
 
0
67
1
avatar+2206 

Help.

NotSoSmart  Feb 1, 2018
Sort: 

1+0 Answers

 #1
avatar+85757 
+2

3.   Perimeter  =  2 ( W + L)

 

So  we have

 

2 ( √13 + 7√13 )

 

2 (8√13)  =

 

16√13  units

 

 

4.  √20 + √45  - √5  =   

 

{ The trick here, NSS, is to try to write  each radical in terms of the last one}

 

√ [ 4 *5 ]  + √ [ 9 * 5 ]   - √5  =

 

√4 *√5  + √9 *√5  -  √5   =

 

2√5  +  3√5  - √5  =

 

5√5  -  1√5   =

 

4√5

 

 

 

cool cool cool

CPhill  Feb 1, 2018

26 Online Users

avatar
We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.  See details