3.5=-2x^2-2x+3

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Solution for 3.5=-2x^2-2x+3 equation:


Simplifying
3.5 = -2x2 + -2x + 3

Reorder the terms:
3.5 = 3 + -2x + -2x2

Solving
3.5 = 3 + -2x + -2x2

Solving for variable 'x'.

Combine like terms: 3.5 + -3 = 0.5
0.5 + 2x + 2x2 = 3 + -2x + -2x2 + -3 + 2x + 2x2

Reorder the terms:
0.5 + 2x + 2x2 = 3 + -3 + -2x + 2x + -2x2 + 2x2

Combine like terms: 3 + -3 = 0
0.5 + 2x + 2x2 = 0 + -2x + 2x + -2x2 + 2x2
0.5 + 2x + 2x2 = -2x + 2x + -2x2 + 2x2

Combine like terms: -2x + 2x = 0
0.5 + 2x + 2x2 = 0 + -2x2 + 2x2
0.5 + 2x + 2x2 = -2x2 + 2x2

Combine like terms: -2x2 + 2x2 = 0
0.5 + 2x + 2x2 = 0

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

Divide each side by '2'.
0.25 + x + x2 = 0

Move the constant term to the right:

Add '-0.25' to each side of the equation.
0.25 + x + -0.25 + x2 = 0 + -0.25

Reorder the terms:
0.25 + -0.25 + x + x2 = 0 + -0.25

Combine like terms: 0.25 + -0.25 = 0.00
0.00 + x + x2 = 0 + -0.25
x + x2 = 0 + -0.25

Combine like terms: 0 + -0.25 = -0.25
x + x2 = -0.25

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.
 + 0.25 + x2 = -0.25 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = -0.25 + 0.25

Combine like terms: -0.25 + 0.25 = 0.00
1.25 + x2 = 0.00

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 0.00

Calculate the square root of the right side: 0.00

Break this problem into two subproblems by setting 
(x + 0.5) equal to 0.00 and 0.00.

Subproblem 1

x + 0.5 = 0.00 Simplifying x + 0.5 = 0.00 Reorder the terms: 0.5 + x = 0.00 Solving 0.5 + x = 0.00 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 = 0.00 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 0.00 + -0.5 x = 0.00 + -0.5 Combine like terms: 0.00 + -0.5 = -0.5 x = -0.5 Simplifying x = -0.5

Subproblem 2

x + 0.5 = 0.00 Simplifying x + 0.5 = 0.00 Reorder the terms: 0.5 + x = 0.00 Solving 0.5 + x = 0.00 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 = 0.00 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 0.00 + -0.5 x = 0.00 + -0.5 Combine like terms: 0.00 + -0.5 = -0.5 x = -0.5 Simplifying x = -0.5

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.5, -0.5}

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