   Chapter 4.CR, Problem 3CR

Chapter
Section
Textbook Problem

For Problems 1-6, simplify each rational expression. n 2 − 3 n − 10 n 2 + n − 2

To determine

To Find:

The expression by simplifying the given rational expression.

Explanation

Approach:

A rational expression is defined as the quotient obtained by a division of two polynomials in the form of p(n)q(n) where p(n) and q(n) are polynomials in such a way that the variable n does not assume values such that q(n)=0.

For values of n where q(n) and k(n) are both nonzero expressions, then by the fundamental principle of fractions, for all polynomials p(n), the following holds.

p(n)k(n)q(n)k(n)=p(n)q(n).

Calculation:

The given rational expression is n23n10n2+n2.

Factorise the numerator n23n10.

n23n10=n25n+2n10=n(n5)+2(n5)=(n+2)(n5)

Factorise the denominator n2+n2.

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