First, we'll impose the constraints of existence of the
square root:
x - 4>
=0
x>=4
Now, we'll
solve the equation by raising to square both sides:
(x - 4)
= 1/(x - 4)^2
Now, we'll subtract 1/(x - 4)^2 both
sides:
(x - 4) - 1/(x - 4)^2 =
0
We'll multiply by (x-4)^2 the
equation:
(x - 4)^3 -
1>=0
We'll solve the difference of cubes using the
formula:
a^3 - b^3 = (a-b)(a^2 + ab +
b^2)
(x - 4)^3 - 1 = (x - 4 -1)[(x-4)^2 + x - 4 +
1]
We'll combine like terms inside
brackets:
(x - 5)[(x-4)^2 + x - 4 + 1] =
0
We'll put each factor as
zero:
x - 5 = 0
We'll add 5
both sides:
x =
5
(x-4)^2 + x - 4 + 1 =
0
We'll expand the square:
x^2
- 8x + 16 + x - 3 = 0
We'll combine like
terms:
x^2 - 7x + 13 = 0
We'll
apply quadratic formula:
x1 = [7 + sqrt(49 -
52)]/2
x1 = (7 +
i*sqrt3)/2
x2 = (7 -
i*sqrt3)/2
The roots of the
given equation are complex numbers. Since there is not any constraint
imposed with regard to the nature of roots, we'll accept them.
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