4x^2+13x-4=0

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


Simplifying
4x2 + 13x + -4 = 0

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

Solving
-4 + 13x + 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'.
-1 + 3.25x + x2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + 3.25x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + 3.25x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 3.25x + x2 = 0 + 1
3.25x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
3.25x + x2 = 1

The x term is 3.25x.  Take half its coefficient (1.625).
Square it (2.640625) and add it to both sides.

Add '2.640625' to each side of the equation.
3.25x + 2.640625 + x2 = 1 + 2.640625

Reorder the terms:
2.640625 + 3.25x + x2 = 1 + 2.640625

Combine like terms: 1 + 2.640625 = 3.640625
2.640625 + 3.25x + x2 = 3.640625

Factor a perfect square on the left side:
(x + 1.625)(x + 1.625) = 3.640625

Calculate the square root of the right side: 1.90804219

Break this problem into two subproblems by setting 
(x + 1.625) equal to 1.90804219 and -1.90804219.

Subproblem 1

x + 1.625 = 1.90804219 Simplifying x + 1.625 = 1.90804219 Reorder the terms: 1.625 + x = 1.90804219 Solving 1.625 + x = 1.90804219 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.625' to each side of the equation. 1.625 + -1.625 + x = 1.90804219 + -1.625 Combine like terms: 1.625 + -1.625 = 0.000 0.000 + x = 1.90804219 + -1.625 x = 1.90804219 + -1.625 Combine like terms: 1.90804219 + -1.625 = 0.28304219 x = 0.28304219 Simplifying x = 0.28304219

Subproblem 2

x + 1.625 = -1.90804219 Simplifying x + 1.625 = -1.90804219 Reorder the terms: 1.625 + x = -1.90804219 Solving 1.625 + x = -1.90804219 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.625' to each side of the equation. 1.625 + -1.625 + x = -1.90804219 + -1.625 Combine like terms: 1.625 + -1.625 = 0.000 0.000 + x = -1.90804219 + -1.625 x = -1.90804219 + -1.625 Combine like terms: -1.90804219 + -1.625 = -3.53304219 x = -3.53304219 Simplifying x = -3.53304219

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.28304219, -3.53304219}

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