7x^2-x=14

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Solution for 7x^2-x=14 equation:


Simplifying
7x2 + -1x = 14

Reorder the terms:
-1x + 7x2 = 14

Solving
-1x + 7x2 = 14

Solving for variable 'x'.

Reorder the terms:
-14 + -1x + 7x2 = 14 + -14

Combine like terms: 14 + -14 = 0
-14 + -1x + 7x2 = 0

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

Divide each side by '7'.
-2 + -0.1428571429x + x2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + -0.1428571429x + 2 + x2 = 0 + 2

Reorder the terms:
-2 + 2 + -0.1428571429x + x2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -0.1428571429x + x2 = 0 + 2
-0.1428571429x + x2 = 0 + 2

Combine like terms: 0 + 2 = 2
-0.1428571429x + x2 = 2

The x term is -0.1428571429x.  Take half its coefficient (-0.07142857145).
Square it (0.005102040819) and add it to both sides.

Add '0.005102040819' to each side of the equation.
-0.1428571429x + 0.005102040819 + x2 = 2 + 0.005102040819

Reorder the terms:
0.005102040819 + -0.1428571429x + x2 = 2 + 0.005102040819

Combine like terms: 2 + 0.005102040819 = 2.005102040819
0.005102040819 + -0.1428571429x + x2 = 2.005102040819

Factor a perfect square on the left side:
(x + -0.07142857145)(x + -0.07142857145) = 2.005102040819

Calculate the square root of the right side: 1.416016257

Break this problem into two subproblems by setting 
(x + -0.07142857145) equal to 1.416016257 and -1.416016257.

Subproblem 1

x + -0.07142857145 = 1.416016257 Simplifying x + -0.07142857145 = 1.416016257 Reorder the terms: -0.07142857145 + x = 1.416016257 Solving -0.07142857145 + x = 1.416016257 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.07142857145' to each side of the equation. -0.07142857145 + 0.07142857145 + x = 1.416016257 + 0.07142857145 Combine like terms: -0.07142857145 + 0.07142857145 = 0.00000000000 0.00000000000 + x = 1.416016257 + 0.07142857145 x = 1.416016257 + 0.07142857145 Combine like terms: 1.416016257 + 0.07142857145 = 1.48744482845 x = 1.48744482845 Simplifying x = 1.48744482845

Subproblem 2

x + -0.07142857145 = -1.416016257 Simplifying x + -0.07142857145 = -1.416016257 Reorder the terms: -0.07142857145 + x = -1.416016257 Solving -0.07142857145 + x = -1.416016257 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.07142857145' to each side of the equation. -0.07142857145 + 0.07142857145 + x = -1.416016257 + 0.07142857145 Combine like terms: -0.07142857145 + 0.07142857145 = 0.00000000000 0.00000000000 + x = -1.416016257 + 0.07142857145 x = -1.416016257 + 0.07142857145 Combine like terms: -1.416016257 + 0.07142857145 = -1.34458768555 x = -1.34458768555 Simplifying x = -1.34458768555

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.48744482845, -1.34458768555}

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