Tuesday, February 14, 2012

Solve for x if ( x-3) = 5/(2x+4)

Given the equality ( x-3) = 5/(2x+4). We need to find x
values that satisfies the equality.


==> (x-3) =
5/(2x+4).


First, we need to re-write the
equation.


We will multiply by the denominator
(2x+4).


==> (x-3)(2x+4) =
5


Now we will open
bracket.


==> x*2x + x*4 - 3*2x -3*4 =
5


==> 2x^2 + 4x - 6x - 12 =
5


Now we will subtract 5 from both
sides.


==> 2x^2 -2x -12 - 5 =
0.


==> 2x^2 - 2x - 17 =
0


Now we will use the formula to determine the
roots.


==> x1= (2 + sqrt(140) / 4 = 2+2sqrt35/
4


==> x1= (1/2)+
(sqrt35)/2


==> x2=
(1/2)-(sqrt35)/2

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