Select the expression that is equivalent to the given polynomial.16x^4-625

I think it is the last one b.c. the first part of the equation//(2x+5)(2x-5) = 16x^4-625 b.c of the fomrmula x^2-y^2...
the last part i is most likely imaginary number which has a value of -1...but you want x^2 - y^2 remember (16x^2-625) so then its the last one
Hope that helps