x=-7x^2+3x+2

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Solution for x=-7x^2+3x+2 equation:


Simplifying
x = -7x2 + 3x + 2

Reorder the terms:
x = 2 + 3x + -7x2

Solving
x = 2 + 3x + -7x2

Solving for variable 'x'.

Reorder the terms:
-2 + x + -3x + 7x2 = 2 + 3x + -7x2 + -2 + -3x + 7x2

Combine like terms: x + -3x = -2x
-2 + -2x + 7x2 = 2 + 3x + -7x2 + -2 + -3x + 7x2

Reorder the terms:
-2 + -2x + 7x2 = 2 + -2 + 3x + -3x + -7x2 + 7x2

Combine like terms: 2 + -2 = 0
-2 + -2x + 7x2 = 0 + 3x + -3x + -7x2 + 7x2
-2 + -2x + 7x2 = 3x + -3x + -7x2 + 7x2

Combine like terms: 3x + -3x = 0
-2 + -2x + 7x2 = 0 + -7x2 + 7x2
-2 + -2x + 7x2 = -7x2 + 7x2

Combine like terms: -7x2 + 7x2 = 0
-2 + -2x + 7x2 = 0

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

Divide each side by '7'.
-0.2857142857 + -0.2857142857x + x2 = 0

Move the constant term to the right:

Add '0.2857142857' to each side of the equation.
-0.2857142857 + -0.2857142857x + 0.2857142857 + x2 = 0 + 0.2857142857

Reorder the terms:
-0.2857142857 + 0.2857142857 + -0.2857142857x + x2 = 0 + 0.2857142857

Combine like terms: -0.2857142857 + 0.2857142857 = 0.0000000000
0.0000000000 + -0.2857142857x + x2 = 0 + 0.2857142857
-0.2857142857x + x2 = 0 + 0.2857142857

Combine like terms: 0 + 0.2857142857 = 0.2857142857
-0.2857142857x + x2 = 0.2857142857

The x term is -0.2857142857x.  Take half its coefficient (-0.1428571429).
Square it (0.02040816328) and add it to both sides.

Add '0.02040816328' to each side of the equation.
-0.2857142857x + 0.02040816328 + x2 = 0.2857142857 + 0.02040816328

Reorder the terms:
0.02040816328 + -0.2857142857x + x2 = 0.2857142857 + 0.02040816328

Combine like terms: 0.2857142857 + 0.02040816328 = 0.30612244898
0.02040816328 + -0.2857142857x + x2 = 0.30612244898

Factor a perfect square on the left side:
(x + -0.1428571429)(x + -0.1428571429) = 0.30612244898

Calculate the square root of the right side: 0.553283335

Break this problem into two subproblems by setting 
(x + -0.1428571429) equal to 0.553283335 and -0.553283335.

Subproblem 1

x + -0.1428571429 = 0.553283335 Simplifying x + -0.1428571429 = 0.553283335 Reorder the terms: -0.1428571429 + x = 0.553283335 Solving -0.1428571429 + x = 0.553283335 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1428571429' to each side of the equation. -0.1428571429 + 0.1428571429 + x = 0.553283335 + 0.1428571429 Combine like terms: -0.1428571429 + 0.1428571429 = 0.0000000000 0.0000000000 + x = 0.553283335 + 0.1428571429 x = 0.553283335 + 0.1428571429 Combine like terms: 0.553283335 + 0.1428571429 = 0.6961404779 x = 0.6961404779 Simplifying x = 0.6961404779

Subproblem 2

x + -0.1428571429 = -0.553283335 Simplifying x + -0.1428571429 = -0.553283335 Reorder the terms: -0.1428571429 + x = -0.553283335 Solving -0.1428571429 + x = -0.553283335 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1428571429' to each side of the equation. -0.1428571429 + 0.1428571429 + x = -0.553283335 + 0.1428571429 Combine like terms: -0.1428571429 + 0.1428571429 = 0.0000000000 0.0000000000 + x = -0.553283335 + 0.1428571429 x = -0.553283335 + 0.1428571429 Combine like terms: -0.553283335 + 0.1428571429 = -0.4104261921 x = -0.4104261921 Simplifying x = -0.4104261921

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.6961404779, -0.4104261921}

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