Enter a simplified polynomial expression for the area of a parallelogram whose base is (x + 8) units and whose height is (x − 2)
2 answers:
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Use the Chinese remainder theorem. Suppose we set 
. Then clearly taken modulo 12, the second term vanishes, and incidentally 
; taken modulo 13, the first term vanishes, but the second term leaves a remainder of 2. To counter this, we can multiply the second term by the inverse of 12 modulo 13, which is 12 since 
.
So, we found that
, but the least positive solution is 
, and in general we can have 
for any integer 
.
Now, since
, or 
, we know that there are 32 possible integers 
that satisfy the congruences.
So, we found that
Now, since