Posted by Marilyn on Monday, August 4, 2008 at 11:02pm.
Factor the following completely
x^4 – 625

Math  Damon, Tuesday, August 5, 2008 at 9:21am
call y = x^2 so x = +/ sqrt y
then
y^2 = 625
y = 25 or y = 25
x = sqrt 25 = +5 or 5
y = sqrt25 = +5i or 5i

Math  tchrwill, Tuesday, August 5, 2008 at 12:44pm
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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