Respuesta :

Answer:

[tex]\frac{x+3}{x}[/tex] or x+3/x

Step-by-step explanation:

Using D.O.T.S (difference of two squares) formula :

[tex]a^{2} -b^{2} = (a+b)(a-b)[/tex]

[tex]x^{2} -9= (x+3)(x-3)[/tex]

Factorise the second bit:

[tex]x^{2} -3x = x(x-3)[/tex]

Now write out this fraction:

[tex]\frac{(x+3)(x-3)}{x(x-3)}[/tex]

Now we can cancel out repeated terms (x-3):

[tex]\frac{(x+3)}{x}[/tex]
This is our final answer:

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

Answer:

[tex]x^{2} -3x-\frac{9}{x^{2} }[/tex]  

Step-by-step explanation:

[tex]x^{2} -9[/tex] ÷ [tex]x^{2} -3x[/tex]

To add or subtract expressions, expand them to make their denominators the same. Multiply [tex]x^{2} -3x[/tex] times [tex]\frac{x^{2} }{x^{2} }[/tex]

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[tex]\frac{(x^{2} -3x)x^{2} }{x^{2} } - \frac{9}{x^{2} }[/tex]

Since [tex]\frac{(x^{2} -3x)x^{2} }{x^{2} }[/tex] and [tex]\frac{9}{x^{2} }[/tex]  have the same denominator, subtract them by subtracting their numerators.

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[tex]\frac{(x^{2} -3x)x^{2} -9}{x^{2} }[/tex]

Do the multiplications in [tex](x^{2} -3x)x^{2} -9[/tex]

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[tex]\frac{x^{4}-3x^{3}-9 }{x^{2} }[/tex]