I need help to understand this algebraic fraction problem

• March 8th 2011, 01:00 PM
Riazy
I need help to understand this algebraic fraction problem
Hello the problem is stated on the uploaded paper

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• March 8th 2011, 01:08 PM
e^(i*pi)
The key is recognising that the numerator is a perfect square:

$x^4+2x^2+1 = (x^2+1)^2$

note that $4x^2 + (x^4-2x^2+1) = x^4+2x^2+1$
• March 8th 2011, 01:17 PM
Riazy
Ah thanks ;) I get stuck at basic things although I am studying at uni <(-_-)>
• March 8th 2011, 01:30 PM
e^(i*pi)
Quote:

Originally Posted by Riazy
Ah thanks ;) I get stuck at basic things although I am studying at uni <(-_-)>

It's often the way, one forgets the basics when working on harder maths