4x^2-14x-13=0

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Solution for 4x^2-14x-13=0 equation:


Simplifying
4x2 + -14x + -13 = 0

Reorder the terms:
-13 + -14x + 4x2 = 0

Solving
-13 + -14x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-3.25 + -3.5x + x2 = 0

Move the constant term to the right:

Add '3.25' to each side of the equation.
-3.25 + -3.5x + 3.25 + x2 = 0 + 3.25

Reorder the terms:
-3.25 + 3.25 + -3.5x + x2 = 0 + 3.25

Combine like terms: -3.25 + 3.25 = 0.00
0.00 + -3.5x + x2 = 0 + 3.25
-3.5x + x2 = 0 + 3.25

Combine like terms: 0 + 3.25 = 3.25
-3.5x + x2 = 3.25

The x term is -3.5x.  Take half its coefficient (-1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
-3.5x + 3.0625 + x2 = 3.25 + 3.0625

Reorder the terms:
3.0625 + -3.5x + x2 = 3.25 + 3.0625

Combine like terms: 3.25 + 3.0625 = 6.3125
3.0625 + -3.5x + x2 = 6.3125

Factor a perfect square on the left side:
(x + -1.75)(x + -1.75) = 6.3125

Calculate the square root of the right side: 2.512468905

Break this problem into two subproblems by setting 
(x + -1.75) equal to 2.512468905 and -2.512468905.

Subproblem 1

x + -1.75 = 2.512468905 Simplifying x + -1.75 = 2.512468905 Reorder the terms: -1.75 + x = 2.512468905 Solving -1.75 + x = 2.512468905 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = 2.512468905 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = 2.512468905 + 1.75 x = 2.512468905 + 1.75 Combine like terms: 2.512468905 + 1.75 = 4.262468905 x = 4.262468905 Simplifying x = 4.262468905

Subproblem 2

x + -1.75 = -2.512468905 Simplifying x + -1.75 = -2.512468905 Reorder the terms: -1.75 + x = -2.512468905 Solving -1.75 + x = -2.512468905 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = -2.512468905 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = -2.512468905 + 1.75 x = -2.512468905 + 1.75 Combine like terms: -2.512468905 + 1.75 = -0.762468905 x = -0.762468905 Simplifying x = -0.762468905

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.262468905, -0.762468905}

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