+0  
 
+5
102
2
avatar

is a2-4 prime

Guest Feb 25, 2017
Sort: 

2+0 Answers

 #1
avatar+26366 
+5

"is a2-4 prime"

 

Depends on the value of a.  

 

If a = 3, then a2 - 4 = 5, which is prime.  

 

If a = 4 then a2 - 4 = 12, which is not prime.

.

Alan  Feb 25, 2017
 #2
avatar+6900 
0

Is a^2 - 4 prime?

 

If a is an integer > 3, it will be prime. Because if the least value to make it not prime = y, then

 

y - 2 > 1, because we can't let y-2 = 1.

y > 3.

 

If a is an integer < 3 it will be either prime or negative.

MaxWong  Feb 25, 2017

5 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