2x^2+14x-12=-3

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Solution for 2x^2+14x-12=-3 equation:


Simplifying
2x2 + 14x + -12 = -3

Reorder the terms:
-12 + 14x + 2x2 = -3

Solving
-12 + 14x + 2x2 = -3

Solving for variable 'x'.

Reorder the terms:
-12 + 3 + 14x + 2x2 = -3 + 3

Combine like terms: -12 + 3 = -9
-9 + 14x + 2x2 = -3 + 3

Combine like terms: -3 + 3 = 0
-9 + 14x + 2x2 = 0

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

Divide each side by '2'.
-4.5 + 7x + x2 = 0

Move the constant term to the right:

Add '4.5' to each side of the equation.
-4.5 + 7x + 4.5 + x2 = 0 + 4.5

Reorder the terms:
-4.5 + 4.5 + 7x + x2 = 0 + 4.5

Combine like terms: -4.5 + 4.5 = 0.0
0.0 + 7x + x2 = 0 + 4.5
7x + x2 = 0 + 4.5

Combine like terms: 0 + 4.5 = 4.5
7x + x2 = 4.5

The x term is 7x.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7x + 12.25 + x2 = 4.5 + 12.25

Reorder the terms:
12.25 + 7x + x2 = 4.5 + 12.25

Combine like terms: 4.5 + 12.25 = 16.75
12.25 + 7x + x2 = 16.75

Factor a perfect square on the left side:
(x + 3.5)(x + 3.5) = 16.75

Calculate the square root of the right side: 4.092676386

Break this problem into two subproblems by setting 
(x + 3.5) equal to 4.092676386 and -4.092676386.

Subproblem 1

x + 3.5 = 4.092676386 Simplifying x + 3.5 = 4.092676386 Reorder the terms: 3.5 + x = 4.092676386 Solving 3.5 + x = 4.092676386 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = 4.092676386 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = 4.092676386 + -3.5 x = 4.092676386 + -3.5 Combine like terms: 4.092676386 + -3.5 = 0.592676386 x = 0.592676386 Simplifying x = 0.592676386

Subproblem 2

x + 3.5 = -4.092676386 Simplifying x + 3.5 = -4.092676386 Reorder the terms: 3.5 + x = -4.092676386 Solving 3.5 + x = -4.092676386 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = -4.092676386 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = -4.092676386 + -3.5 x = -4.092676386 + -3.5 Combine like terms: -4.092676386 + -3.5 = -7.592676386 x = -7.592676386 Simplifying x = -7.592676386

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.592676386, -7.592676386}

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