0=7x^2-26x-14

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Solution for 0=7x^2-26x-14 equation:


Simplifying
0 = 7x2 + -26x + -14

Reorder the terms:
0 = -14 + -26x + 7x2

Solving
0 = -14 + -26x + 7x2

Solving for variable 'x'.

Combine like terms: 0 + 14 = 14
14 + 26x + -7x2 = -14 + -26x + 7x2 + 14 + 26x + -7x2

Reorder the terms:
14 + 26x + -7x2 = -14 + 14 + -26x + 26x + 7x2 + -7x2

Combine like terms: -14 + 14 = 0
14 + 26x + -7x2 = 0 + -26x + 26x + 7x2 + -7x2
14 + 26x + -7x2 = -26x + 26x + 7x2 + -7x2

Combine like terms: -26x + 26x = 0
14 + 26x + -7x2 = 0 + 7x2 + -7x2
14 + 26x + -7x2 = 7x2 + -7x2

Combine like terms: 7x2 + -7x2 = 0
14 + 26x + -7x2 = 0

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

Divide each side by '-7'.
-2 + -3.714285714x + x2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + -3.714285714x + 2 + x2 = 0 + 2

Reorder the terms:
-2 + 2 + -3.714285714x + x2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -3.714285714x + x2 = 0 + 2
-3.714285714x + x2 = 0 + 2

Combine like terms: 0 + 2 = 2
-3.714285714x + x2 = 2

The x term is -3.714285714x.  Take half its coefficient (-1.857142857).
Square it (3.448979591) and add it to both sides.

Add '3.448979591' to each side of the equation.
-3.714285714x + 3.448979591 + x2 = 2 + 3.448979591

Reorder the terms:
3.448979591 + -3.714285714x + x2 = 2 + 3.448979591

Combine like terms: 2 + 3.448979591 = 5.448979591
3.448979591 + -3.714285714x + x2 = 5.448979591

Factor a perfect square on the left side:
(x + -1.857142857)(x + -1.857142857) = 5.448979591

Calculate the square root of the right side: 2.334304948

Break this problem into two subproblems by setting 
(x + -1.857142857) equal to 2.334304948 and -2.334304948.

Subproblem 1

x + -1.857142857 = 2.334304948 Simplifying x + -1.857142857 = 2.334304948 Reorder the terms: -1.857142857 + x = 2.334304948 Solving -1.857142857 + x = 2.334304948 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.857142857' to each side of the equation. -1.857142857 + 1.857142857 + x = 2.334304948 + 1.857142857 Combine like terms: -1.857142857 + 1.857142857 = 0.000000000 0.000000000 + x = 2.334304948 + 1.857142857 x = 2.334304948 + 1.857142857 Combine like terms: 2.334304948 + 1.857142857 = 4.191447805 x = 4.191447805 Simplifying x = 4.191447805

Subproblem 2

x + -1.857142857 = -2.334304948 Simplifying x + -1.857142857 = -2.334304948 Reorder the terms: -1.857142857 + x = -2.334304948 Solving -1.857142857 + x = -2.334304948 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.857142857' to each side of the equation. -1.857142857 + 1.857142857 + x = -2.334304948 + 1.857142857 Combine like terms: -1.857142857 + 1.857142857 = 0.000000000 0.000000000 + x = -2.334304948 + 1.857142857 x = -2.334304948 + 1.857142857 Combine like terms: -2.334304948 + 1.857142857 = -0.477162091 x = -0.477162091 Simplifying x = -0.477162091

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.191447805, -0.477162091}

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