Question 247546
t^3+125 could you help you with me with this problem please, is it prime.

Since t^3 and 125 are both perfect cubes t^3 + 125 is the sum of cubes.

We know in general that a^3+b^3 = (a+b)*(a^2- ab + b^2)

So in this case a=t and b=5. 

t^3+125 is not prime.