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Which expression is equivalent to [tex]\frac{-9 x^{-1} y^{-9}}{-15 x^5 y^{-3}}[/tex]? Assume [tex]x \neq 0, y \neq 0[/tex].

A. [tex]\frac{3}{5 x^5 y^3}[/tex]

B. [tex]\frac{3}{5 x^6 y^6}[/tex]

C. [tex]\frac{5}{3 x^5 y^3}[/tex]

D. [tex]\frac{5}{3 x^6 y^6}[/tex]


Sagot :

To simplify the expression [tex]\(\frac{-9 x^{-1} y^{-9}}{-15 x^5 y^{-3}}\)[/tex]:

1. Simplify the coefficients:
The coefficients are [tex]\(-9\)[/tex] and [tex]\(-15\)[/tex]:
[tex]\[ \frac{-9}{-15} = \frac{9}{15} = \frac{3}{5} \][/tex]

2. Simplify the [tex]\(x\)[/tex] terms:
The [tex]\(x\)[/tex] terms are [tex]\(x^{-1}\)[/tex] in the numerator and [tex]\(x^5\)[/tex] in the denominator:
[tex]\[ \frac{x^{-1}}{x^5} = x^{-1 - 5} = x^{-6} \][/tex]

3. Simplify the [tex]\(y\)[/tex] terms:
The [tex]\(y\)[/tex] terms are [tex]\(y^{-9}\)[/tex] in the numerator and [tex]\(y^{-3}\)[/tex] in the denominator:
[tex]\[ \frac{y^{-9}}{y^{-3}} = y^{-9 - (-3)} = y^{-9 + 3} = y^{-6} \][/tex]

4. Combine the results:
Putting all the simplified parts together, we get:
[tex]\[ \frac{3}{5} x^{-6} y^{-6} \][/tex]
To write it in the standard form, we recognize that [tex]\(x^{-6}\)[/tex] is [tex]\(\frac{1}{x^6}\)[/tex] and [tex]\(y^{-6}\)[/tex] is [tex]\(\frac{1}{y^6}\)[/tex]:
[tex]\[ \frac{3}{5} \cdot \frac{1}{x^6} \cdot \frac{1}{y^6} = \frac{3}{5 x^6 y^6} \][/tex]

Thus, the expression [tex]\(\frac{-9 x^{-1} y^{-9}}{-15 x^5 y^{-3}}\)[/tex] simplifies to [tex]\(\frac{3}{5 x^6 y^6}\)[/tex].

The correct answer is:
[tex]\[ \boxed{\frac{3}{5 x^6 y^6}} \][/tex]