+0  
 
0
89
2
avatar+81 

Find the largest prime factor of 451^2-137^2 without using a calculator.

 Nov 6, 2018
 #1
avatar+94526 
+2

451^2 - 137^2  =

 

( 451 - 137) (451 + 137)  =

 

( 314) ( 588 )

 

[ 157 * 2 ]  [ 294 * 2 ]

 

[ 157 * 2 ] [ 147 * 2 * 2 ]

 

[ 157 * 2 ]  [ 49 * 3 * 2 * 2 ]

 

[ 157 * 2 ] [  7 * 7 * 3 * 2 * 2 ]

 

157 * 7^2 * 2^3 * 3

 

So.....157 is the largest prme factor

 

 

cool cool cool

 Nov 6, 2018
 #2
avatar+536 
-1

Nice, but you spelled prime wrong ;)

CoolStuffYT  Nov 10, 2018

19 Online Users

avatar
avatar

New Privacy Policy

We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive information about your use of our website.
For more information: our cookie policy and privacy policy.