7x^2=2-7x

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


Simplifying
7x2 = 2 + -7x

Solving
7x2 = 2 + -7x

Solving for variable 'x'.

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

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

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

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

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

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

Move the constant term to the right:

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

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

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

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

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

Add '0.25' to each side of the equation.
 + 0.25 + x2 = 0.2857142857 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 0.2857142857 + 0.25

Combine like terms: 0.2857142857 + 0.25 = 0.5357142857
1.25 + x2 = 0.5357142857

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 0.5357142857

Calculate the square root of the right side: 0.731925055

Break this problem into two subproblems by setting 
(x + 0.5) equal to 0.731925055 and -0.731925055.

Subproblem 1

x + 0.5 = 0.731925055 Simplifying x + 0.5 = 0.731925055 Reorder the terms: 0.5 + x = 0.731925055 Solving 0.5 + x = 0.731925055 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 0.731925055 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 0.731925055 + -0.5 x = 0.731925055 + -0.5 Combine like terms: 0.731925055 + -0.5 = 0.231925055 x = 0.231925055 Simplifying x = 0.231925055

Subproblem 2

x + 0.5 = -0.731925055 Simplifying x + 0.5 = -0.731925055 Reorder the terms: 0.5 + x = -0.731925055 Solving 0.5 + x = -0.731925055 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -0.731925055 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -0.731925055 + -0.5 x = -0.731925055 + -0.5 Combine like terms: -0.731925055 + -0.5 = -1.231925055 x = -1.231925055 Simplifying x = -1.231925055

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.231925055, -1.231925055}

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