(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

For what integers is x^2-2x-3 divisible by 8.

give answer x = a list of natural numbers (mod 8)

2. Relevant equations

3. The attempt at a solution

I thought x(x-2) = 3 (mod 8) and tried to find all values that satisfied this. But got really stuck.

I also tried to find values that gave a reminder of zero when the quadratic was divided by 8, which i think was 7, 11, 15 but this was not correct.

I thought this was quite difficult as i thought my solutions made sense, but i must have misunderstood it somewhere. Thanks! its much appreciated.

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# Help with a mod problem

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