lopezismael25oz0rk6 lopezismael25oz0rk6
  • 16-01-2019
  • Mathematics
contestada

Which sum is equal to

Which sum is equal to class=

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frika
frika frika
  • 16-01-2019

Answer:

Correct choice is A

Step-by-step explanation:

Note that the denominator [tex]x^2-25=(x-5)(x+5).[/tex] Then rewrite the numerator [tex]x^2+6x-5[/tex] as [tex]x^2+5x+x-5=x(x+5)+(x-5).[/tex]

Substitute both expression into the initial expression:

[tex]\dfrac{x^2+6x-5}{x^2-25}=\dfrac{x(x+5)+(x-5)}{(x+5)(x-5)}=\dfrac{x(x+5)}{(x+5)(x-5)}+\dfrac{(x-5)}{(x+5)(x-5)}=\dfrac{x}{x-5}+\dfrac{1}{x+5}.[/tex]



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