-2x^2+12x+3=0

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Solution for -2x^2+12x+3=0 equation:


Simplifying
-2x2 + 12x + 3 = 0

Reorder the terms:
3 + 12x + -2x2 = 0

Solving
3 + 12x + -2x2 = 0

Solving for variable 'x'.

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

Divide each side by '-2'.
-1.5 + -6x + x2 = 0

Move the constant term to the right:

Add '1.5' to each side of the equation.
-1.5 + -6x + 1.5 + x2 = 0 + 1.5

Reorder the terms:
-1.5 + 1.5 + -6x + x2 = 0 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + -6x + x2 = 0 + 1.5
-6x + x2 = 0 + 1.5

Combine like terms: 0 + 1.5 = 1.5
-6x + x2 = 1.5

The x term is -6x.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6x + 9 + x2 = 1.5 + 9

Reorder the terms:
9 + -6x + x2 = 1.5 + 9

Combine like terms: 1.5 + 9 = 10.5
9 + -6x + x2 = 10.5

Factor a perfect square on the left side:
(x + -3)(x + -3) = 10.5

Calculate the square root of the right side: 3.240370349

Break this problem into two subproblems by setting 
(x + -3) equal to 3.240370349 and -3.240370349.

Subproblem 1

x + -3 = 3.240370349 Simplifying x + -3 = 3.240370349 Reorder the terms: -3 + x = 3.240370349 Solving -3 + x = 3.240370349 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = 3.240370349 + 3 Combine like terms: -3 + 3 = 0 0 + x = 3.240370349 + 3 x = 3.240370349 + 3 Combine like terms: 3.240370349 + 3 = 6.240370349 x = 6.240370349 Simplifying x = 6.240370349

Subproblem 2

x + -3 = -3.240370349 Simplifying x + -3 = -3.240370349 Reorder the terms: -3 + x = -3.240370349 Solving -3 + x = -3.240370349 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = -3.240370349 + 3 Combine like terms: -3 + 3 = 0 0 + x = -3.240370349 + 3 x = -3.240370349 + 3 Combine like terms: -3.240370349 + 3 = -0.240370349 x = -0.240370349 Simplifying x = -0.240370349

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.240370349, -0.240370349}

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