call y = x^2 so x = +/- sqrt y
y^2 = 625
y = 25 or y = -25
x = sqrt 25 = +5 or -5
y = sqrt-25 = +5i or -5i
Any expression of the form a^2 - b^2 can be written as (a + b)(a - b).
Therefore, x^4 - 625) = (x^2 + 25)(x^2 - 25).
Then, (x^2 + 25)(x + 5)(x - 5)
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