ive got a college exam coming up in 2 days for maths
c1, c2 and probably c3 and c4...
could someone help me out with these questions plz
thxxxx
x^4 - 625
which are the following are its factors
a) x - 5
b) x + 5
c) x^2 + 25
is it a)
or b)
or c)
or (a) and (b)
or all of them ?
this is of the form a^2-b^2=(a+b)(a-b)
root x^4=x^2 and root 625=25
therefore (x^2+25)(x^2-25), now we again use the identity
(x^2+25)(x+5)(x-5)
therefore a,b and c are correct