anonymous
  • anonymous
What are the real and extraneous solutions in this equation: (x)/(x+2) + (5)/(x-3) = (25)/(x^2-x-6)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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radar
  • radar
Roots are x=-5, x=3, the x=3 is an extraneous root.
anonymous
  • anonymous
ok thanks. could you show me how you found those answers?
radar
  • radar
Yes be glad to. First I did the addition. The common denominator is (x+2)(x-3)

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radar
  • radar
The numerators are then x(x-3) +5(x+2) over the common denominator of (x+2)(x-3) kind of like this: x(x-3) +5(x+2) -------------- =25/(x^2-x-6) (x+2)(x-3) You follow so far?
anonymous
  • anonymous
yes i do.
radar
  • radar
Now lets work on the denominator of the fraction on the right side of the equal sign. the denominator is x^2-x-6 This can be factored to look like (x-3)(x+2) Now we have on the right of the equal sign: 25 ------------------ (x-3)(x+2) You still following?
anonymous
  • anonymous
yes
radar
  • radar
Now look at both fractions, notice the denominator on the left is also equal to the denominator on the right of our two fractions that are equal. Do you see that?
anonymous
  • anonymous
yes i do
radar
  • radar
well since they are equal, then for the two fractions to be equal, the numerators must be equal,so we now can write: x(x-3) + 5(x+2) = 25 Do you follow that kind of reasoning?
anonymous
  • anonymous
ok i see
radar
  • radar
can you take it from there are do you want me walk you thru the solution.?
anonymous
  • anonymous
no i can take it from here. thank you very much!
radar
  • radar
O.K and the root equal 3 is extraneous as it results in a division by zero and as you know that is a no-no
anonymous
  • anonymous
ok, so the final equation before you get (x+5)(x-3) is x^2+2x-15 correct?
radar
  • radar
Yes
anonymous
  • anonymous
thanks!!
radar
  • radar
NP

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