64.95=(25-x)+(3.12)+(x)x(2.49)

Solution for 64.95=(25-x)+(3.12)+(x)x(2.49) equation:

Simplifying
64.95 = (25 + -1x) + (3.12) + (x) * x(2.49)

Remove parenthesis around (25 + -1x)
64.95 = 25 + -1x + (3.12) + (x) * x(2.49)
64.95 = 25 + -1x + 3.12 + (x) * x(2.49)

Reorder the terms for easier multiplication:
64.95 = 25 + -1x + 3.12 + 2.49x * x

Multiply x * x
64.95 = 25 + -1x + 3.12 + 2.49x2

Reorder the terms:
64.95 = 25 + 3.12 + -1x + 2.49x2

Combine like terms: 25 + 3.12 = 28.12
64.95 = 28.12 + -1x + 2.49x2

Solving
64.95 = 28.12 + -1x + 2.49x2

Solving for variable 'x'.

Combine like terms: 64.95 + -28.12 = 36.83
36.83 + x + -2.49x2 = 28.12 + -1x + 2.49x2 + -28.12 + x + -2.49x2

Reorder the terms:
36.83 + x + -2.49x2 = 28.12 + -28.12 + -1x + x + 2.49x2 + -2.49x2

Combine like terms: 28.12 + -28.12 = 0.00
36.83 + x + -2.49x2 = 0.00 + -1x + x + 2.49x2 + -2.49x2
36.83 + x + -2.49x2 = -1x + x + 2.49x2 + -2.49x2

Combine like terms: -1x + x = 0
36.83 + x + -2.49x2 = 0 + 2.49x2 + -2.49x2
36.83 + x + -2.49x2 = 2.49x2 + -2.49x2

Combine like terms: 2.49x2 + -2.49x2 = 0.00
36.83 + x + -2.49x2 = 0.00

Begin completing the square.  Divide all terms by
-2.49 the coefficient of the squared term: 

Divide each side by '-2.49'.
-14.79116466 + -0.4016064257x + x2 = 0

Move the constant term to the right:

Add '14.79116466' to each side of the equation.
-14.79116466 + -0.4016064257x + 14.79116466 + x2 = 0 + 14.79116466

Reorder the terms:
-14.79116466 + 14.79116466 + -0.4016064257x + x2 = 0 + 14.79116466

Combine like terms: -14.79116466 + 14.79116466 = 0.00000000
0.00000000 + -0.4016064257x + x2 = 0 + 14.79116466
-0.4016064257x + x2 = 0 + 14.79116466

Combine like terms: 0 + 14.79116466 = 14.79116466
-0.4016064257x + x2 = 14.79116466

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-0.4016064257x + 0.25 + x2 = 14.79116466 + 0.25

Reorder the terms:
0.25 + -0.4016064257x + x2 = 14.79116466 + 0.25

Combine like terms: 14.79116466 + 0.25 = 15.04116466
0.25 + -0.4016064257x + x2 = 15.04116466

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 15.04116466

Calculate the square root of the right side: 3.87829404

Break this problem into two subproblems by setting 
(x + 0.5) equal to 3.87829404 and -3.87829404.

Subproblem 1
x + 0.5 = 3.87829404

Simplifying
x + 0.5 = 3.87829404

Reorder the terms:
0.5 + x = 3.87829404

Solving
0.5 + x = 3.87829404

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-0.5' to each side of the equation.
0.5 + -0.5 + x = 3.87829404 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + x = 3.87829404 + -0.5
x = 3.87829404 + -0.5

Combine like terms: 3.87829404 + -0.5 = 3.37829404
x = 3.37829404

Simplifying
x = 3.37829404

Subproblem 2
x + 0.5 = -3.87829404

Simplifying
x + 0.5 = -3.87829404

Reorder the terms:
0.5 + x = -3.87829404

Solving
0.5 + x = -3.87829404

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-0.5' to each side of the equation.
0.5 + -0.5 + x = -3.87829404 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + x = -3.87829404 + -0.5
x = -3.87829404 + -0.5

Combine like terms: -3.87829404 + -0.5 = -4.37829404
x = -4.37829404

Simplifying
x = -4.37829404

Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {3.37829404, -4.37829404}