Question

factorise the x^4-625

Answer 1

X^4-625
(X^2)^2-(25)2
ITS IDENTITY match from a^2-b^2=(a-b)(a+b)

so 
(x^2-25)(x^2+25)
(x-5)^2(x+5)^2






i hope this will help u 
BY DEVANSH