-4x^2-2x=-3

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Solution for -4x^2-2x=-3 equation:


Simplifying
-4x2 + -2x = -3

Reorder the terms:
-2x + -4x2 = -3

Solving
-2x + -4x2 = -3

Solving for variable 'x'.

Reorder the terms:
3 + -2x + -4x2 = -3 + 3

Combine like terms: -3 + 3 = 0
3 + -2x + -4x2 = 0

Begin completing the square.  Divide all terms by
-4 the coefficient of the squared term: 

Divide each side by '-4'.
-0.75 + 0.5x + x2 = 0

Move the constant term to the right:

Add '0.75' to each side of the equation.
-0.75 + 0.5x + 0.75 + x2 = 0 + 0.75

Reorder the terms:
-0.75 + 0.75 + 0.5x + x2 = 0 + 0.75

Combine like terms: -0.75 + 0.75 = 0.00
0.00 + 0.5x + x2 = 0 + 0.75
0.5x + x2 = 0 + 0.75

Combine like terms: 0 + 0.75 = 0.75
0.5x + x2 = 0.75

The x term is 0.5x.  Take half its coefficient (0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
0.5x + 0.0625 + x2 = 0.75 + 0.0625

Reorder the terms:
0.0625 + 0.5x + x2 = 0.75 + 0.0625

Combine like terms: 0.75 + 0.0625 = 0.8125
0.0625 + 0.5x + x2 = 0.8125

Factor a perfect square on the left side:
(x + 0.25)(x + 0.25) = 0.8125

Calculate the square root of the right side: 0.901387819

Break this problem into two subproblems by setting 
(x + 0.25) equal to 0.901387819 and -0.901387819.

Subproblem 1

x + 0.25 = 0.901387819 Simplifying x + 0.25 = 0.901387819 Reorder the terms: 0.25 + x = 0.901387819 Solving 0.25 + x = 0.901387819 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = 0.901387819 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = 0.901387819 + -0.25 x = 0.901387819 + -0.25 Combine like terms: 0.901387819 + -0.25 = 0.651387819 x = 0.651387819 Simplifying x = 0.651387819

Subproblem 2

x + 0.25 = -0.901387819 Simplifying x + 0.25 = -0.901387819 Reorder the terms: 0.25 + x = -0.901387819 Solving 0.25 + x = -0.901387819 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = -0.901387819 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = -0.901387819 + -0.25 x = -0.901387819 + -0.25 Combine like terms: -0.901387819 + -0.25 = -1.151387819 x = -1.151387819 Simplifying x = -1.151387819

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.651387819, -1.151387819}

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