Question
Solve the forlowing rational & fuation [ (5)/(x^2)-4-(8)/(x^2)-1=(2)/(x^2)-3 x+2-(20)/(x^2)-3 x+2 ]
Solution
4.7
(362 Votos)
Janaína
Veterano · Tutor por 11 anos
Resposta
To solve the given rational equation, we first need to simplify and find a common denominator for each side of the equation.The equation is:
First, let's factor each quadratic expression in the denominators:1.
can be factored as \((x-2)(x+2)\).2.
can be factored as \((x-1)(x+1)\).3.
can be factored as \((x-1)(x-2)\).Now, rewrite the equation with these factored forms:
Simplify the right-hand side:
Now the equation becomes:
To solve this equation, we need a common denominator for all terms. The least common denominator (LCD) is \((x-2)(x+2)(x-1)(x+1)\).Rewrite each term with the LCD:- The first term: \(\frac{5}{(x-2)(x+2)}\) becomes \(\frac{5(x-1)(x+1)}{(x-2)(x+2)(x-1)(x+1)}\).- The second term: \(\frac{8}{(x-1)(x+1)}\) becomes \(\frac{8(x-2)(x+2)}{(x-2)(x+2)(x-1)(x+1)}\).- The third term: \(\frac{-18}{(x-1)(x-2)}\) becomes \(\frac{-18(x+2)}{(x-2)(x+2)(x-1)(x+1)}\).Now, combine the fractions:
Since the denominators are the same, equate the numerators:
Expand and simplify each term:- \(5(x-1)(x+1) = 5(x^2 - 1) = 5x^2 - 5\)- \(8(x-2)(x+2) = 8(x^2 - 4) = 8x^2 - 32\)- \(-18(x+2) = -18x - 36\)Substitute back into the equation:
Simplify:
Rearrange all terms to one side:
Divide the entire equation by
to simplify:
Solve this quadratic equation using the quadratic formula:
where
,
, and
.Calculate the discriminant:
Thus, the solutions are:
Simplify
:
So the solutions are:
Therefore, the solutions to the equation are
and
.