-x=7x^2+4x-7

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Solution for -x=7x^2+4x-7 equation:


Simplifying
-1x = 7x2 + 4x + -7

Reorder the terms:
-1x = -7 + 4x + 7x2

Solving
-1x = -7 + 4x + 7x2

Solving for variable 'x'.

Reorder the terms:
7 + -1x + -4x + -7x2 = -7 + 4x + 7x2 + 7 + -4x + -7x2

Combine like terms: -1x + -4x = -5x
7 + -5x + -7x2 = -7 + 4x + 7x2 + 7 + -4x + -7x2

Reorder the terms:
7 + -5x + -7x2 = -7 + 7 + 4x + -4x + 7x2 + -7x2

Combine like terms: -7 + 7 = 0
7 + -5x + -7x2 = 0 + 4x + -4x + 7x2 + -7x2
7 + -5x + -7x2 = 4x + -4x + 7x2 + -7x2

Combine like terms: 4x + -4x = 0
7 + -5x + -7x2 = 0 + 7x2 + -7x2
7 + -5x + -7x2 = 7x2 + -7x2

Combine like terms: 7x2 + -7x2 = 0
7 + -5x + -7x2 = 0

Begin completing the square.  Divide all terms by
-7 the coefficient of the squared term: 

Divide each side by '-7'.
-1 + 0.7142857143x + x2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + 0.7142857143x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + 0.7142857143x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 0.7142857143x + x2 = 0 + 1
0.7142857143x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
0.7142857143x + x2 = 1

The x term is 0.7142857143x.  Take half its coefficient (0.3571428572).
Square it (0.1275510204) and add it to both sides.

Add '0.1275510204' to each side of the equation.
0.7142857143x + 0.1275510204 + x2 = 1 + 0.1275510204

Reorder the terms:
0.1275510204 + 0.7142857143x + x2 = 1 + 0.1275510204

Combine like terms: 1 + 0.1275510204 = 1.1275510204
0.1275510204 + 0.7142857143x + x2 = 1.1275510204

Factor a perfect square on the left side:
(x + 0.3571428572)(x + 0.3571428572) = 1.1275510204

Calculate the square root of the right side: 1.061862053

Break this problem into two subproblems by setting 
(x + 0.3571428572) equal to 1.061862053 and -1.061862053.

Subproblem 1

x + 0.3571428572 = 1.061862053 Simplifying x + 0.3571428572 = 1.061862053 Reorder the terms: 0.3571428572 + x = 1.061862053 Solving 0.3571428572 + x = 1.061862053 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3571428572' to each side of the equation. 0.3571428572 + -0.3571428572 + x = 1.061862053 + -0.3571428572 Combine like terms: 0.3571428572 + -0.3571428572 = 0.0000000000 0.0000000000 + x = 1.061862053 + -0.3571428572 x = 1.061862053 + -0.3571428572 Combine like terms: 1.061862053 + -0.3571428572 = 0.7047191958 x = 0.7047191958 Simplifying x = 0.7047191958

Subproblem 2

x + 0.3571428572 = -1.061862053 Simplifying x + 0.3571428572 = -1.061862053 Reorder the terms: 0.3571428572 + x = -1.061862053 Solving 0.3571428572 + x = -1.061862053 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3571428572' to each side of the equation. 0.3571428572 + -0.3571428572 + x = -1.061862053 + -0.3571428572 Combine like terms: 0.3571428572 + -0.3571428572 = 0.0000000000 0.0000000000 + x = -1.061862053 + -0.3571428572 x = -1.061862053 + -0.3571428572 Combine like terms: -1.061862053 + -0.3571428572 = -1.4190049102 x = -1.4190049102 Simplifying x = -1.4190049102

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.7047191958, -1.4190049102}

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