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Help.

NotSoSmart  Feb 1, 2018
 #1
avatar+87639 
+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

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