(-0.125x^2+2x)-(0.1875x^2-3)=2.5

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Solution for (-0.125x^2+2x)-(0.1875x^2-3)=2.5 equation:


Simplifying
(-0.125x2 + 2x) + -1(0.1875x2 + -3) = 2.5

Reorder the terms:
(2x + -0.125x2) + -1(0.1875x2 + -3) = 2.5

Remove parenthesis around (2x + -0.125x2)
2x + -0.125x2 + -1(0.1875x2 + -3) = 2.5

Reorder the terms:
2x + -0.125x2 + -1(-3 + 0.1875x2) = 2.5
2x + -0.125x2 + (-3 * -1 + 0.1875x2 * -1) = 2.5
2x + -0.125x2 + (3 + -0.1875x2) = 2.5

Reorder the terms:
3 + 2x + -0.125x2 + -0.1875x2 = 2.5

Combine like terms: -0.125x2 + -0.1875x2 = -0.3125x2
3 + 2x + -0.3125x2 = 2.5

Solving
3 + 2x + -0.3125x2 = 2.5

Solving for variable 'x'.

Reorder the terms:
3 + -2.5 + 2x + -0.3125x2 = 2.5 + -2.5

Combine like terms: 3 + -2.5 = 0.5
0.5 + 2x + -0.3125x2 = 2.5 + -2.5

Combine like terms: 2.5 + -2.5 = 0.0
0.5 + 2x + -0.3125x2 = 0.0

Begin completing the square.  Divide all terms by
-0.3125 the coefficient of the squared term: 

Divide each side by '-0.3125'.
-1.6 + -6.4x + x2 = 0

Move the constant term to the right:

Add '1.6' to each side of the equation.
-1.6 + -6.4x + 1.6 + x2 = 0 + 1.6

Reorder the terms:
-1.6 + 1.6 + -6.4x + x2 = 0 + 1.6

Combine like terms: -1.6 + 1.6 = 0.0
0.0 + -6.4x + x2 = 0 + 1.6
-6.4x + x2 = 0 + 1.6

Combine like terms: 0 + 1.6 = 1.6
-6.4x + x2 = 1.6

The x term is -6.4x.  Take half its coefficient (-3.2).
Square it (10.24) and add it to both sides.

Add '10.24' to each side of the equation.
-6.4x + 10.24 + x2 = 1.6 + 10.24

Reorder the terms:
10.24 + -6.4x + x2 = 1.6 + 10.24

Combine like terms: 1.6 + 10.24 = 11.84
10.24 + -6.4x + x2 = 11.84

Factor a perfect square on the left side:
(x + -3.2)(x + -3.2) = 11.84

Calculate the square root of the right side: 3.440930107

Break this problem into two subproblems by setting 
(x + -3.2) equal to 3.440930107 and -3.440930107.

Subproblem 1

x + -3.2 = 3.440930107 Simplifying x + -3.2 = 3.440930107 Reorder the terms: -3.2 + x = 3.440930107 Solving -3.2 + x = 3.440930107 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.2' to each side of the equation. -3.2 + 3.2 + x = 3.440930107 + 3.2 Combine like terms: -3.2 + 3.2 = 0.0 0.0 + x = 3.440930107 + 3.2 x = 3.440930107 + 3.2 Combine like terms: 3.440930107 + 3.2 = 6.640930107 x = 6.640930107 Simplifying x = 6.640930107

Subproblem 2

x + -3.2 = -3.440930107 Simplifying x + -3.2 = -3.440930107 Reorder the terms: -3.2 + x = -3.440930107 Solving -3.2 + x = -3.440930107 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.2' to each side of the equation. -3.2 + 3.2 + x = -3.440930107 + 3.2 Combine like terms: -3.2 + 3.2 = 0.0 0.0 + x = -3.440930107 + 3.2 x = -3.440930107 + 3.2 Combine like terms: -3.440930107 + 3.2 = -0.240930107 x = -0.240930107 Simplifying x = -0.240930107

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.640930107, -0.240930107}

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