Tuesday, August 19, 2014

Reduce to the lowest terms: (x^5-x^3)/(x^2 - 3x + 2)

To reduce to the lowest terms, we'll have to factorize the
numerator and to write the denominator as a product of linear
factors.


We'll factorize the numerator by
x^3:


(x^5-x^3) = x^3(x^2 -
1)


But x^2 - 1 is a difference of
squares:


 x^2 - 1 =
(x-1)(x+1)


We'll compute the roots of the
equation:


(x^2 - 3x + 2) =
0


x1 = 2


x2 =
1


S = 2+1 = 3


P =
2*1


The equation is written as a product of linear
factors:


(x^2 - 3x + 2) =
(x-x1)(x-x2)


(x^2 - 3x + 2) =
(x-1)(x-2)


We'll re-write the
expression:


x^3(x-1)(x+1)/(x-1)(x-2) =
x^3(x+1)/(x-2)

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