+0  
 
-1
101
4
avatar+44 

deleted

 

 Nov 10, 2019
edited by htzhang919  Nov 16, 2019
edited by Melody  Nov 16, 2019
 #1
avatar+2551 
+2

I am so sorry I dont have a real strategy for this.

 

lets guess and check:

multiply of 20 plus 8 4x = 8 Mod (20) 3x = 16 (mode 20)
28 x = 7 Nope
48 x = 12 x = 12

 

So 122 = 144

 

144/20 is 

 

7 with a remainder of 4.

 

So the answer is 4.

 Nov 10, 2019
 #2
avatar+44 
0

deleted

 Nov 10, 2019
edited by htzhang919  Nov 16, 2019
 #3
avatar+1828 
0

Here’s a copy of the original question.

 

If \(4x\equiv 8\pmod{20}\) and \(3x\equiv 16\pmod{20}\), then what is the remainder when \(x^2\) is divided by 20?

 

 

 

GA

 Nov 16, 2019
 #4
avatar+106981 
0

Thanks Ginger.    laugh

Melody  Nov 16, 2019

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