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What is the least common denominator (LCD) of the rational expressions being added?

[tex]\[ \frac{2}{x} + \frac{3}{x^2} \][/tex]

A. [tex]\( x \)[/tex]

B. [tex]\( x^2 \)[/tex]

C. [tex]\( x^3 \)[/tex]


Sagot :

To determine the least common denominator (LCD) of the rational expressions [tex]\(\frac{2}{x}\)[/tex] and [tex]\(\frac{3}{x^2}\)[/tex], you should follow these steps:

1. Identify the denominators of each rational expression:
- The denominator of [tex]\(\frac{2}{x}\)[/tex] is [tex]\(x\)[/tex].
- The denominator of [tex]\(\frac{3}{x^2}\)[/tex] is [tex]\(x^2\)[/tex].

2. Factor each denominator into its prime factors:
- For [tex]\(x\)[/tex], the prime factor is [tex]\(x\)[/tex].
- For [tex]\(x^2\)[/tex], the prime factor is [tex]\(x \cdot x\)[/tex], which is [tex]\(x\)[/tex] two times.

3. Determine the LCD by taking the highest power of each distinct prime factor present in any of the denominators:
- The highest power of [tex]\(x\)[/tex] between the denominators [tex]\(x\)[/tex] and [tex]\(x^2\)[/tex] is [tex]\(x^2\)[/tex].

Thus, the least common denominator (LCD) for the expressions [tex]\(\frac{2}{x}\)[/tex] and [tex]\(\frac{3}{x^2}\)[/tex] is [tex]\(\boxed{x^2}\)[/tex].