4x^2+5x-13=0

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Solution for 4x^2+5x-13=0 equation:


Simplifying
4x2 + 5x + -13 = 0

Reorder the terms:
-13 + 5x + 4x2 = 0

Solving
-13 + 5x + 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 + 1.25x + x2 = 0

Move the constant term to the right:

Add '3.25' to each side of the equation.
-3.25 + 1.25x + 3.25 + x2 = 0 + 3.25

Reorder the terms:
-3.25 + 3.25 + 1.25x + x2 = 0 + 3.25

Combine like terms: -3.25 + 3.25 = 0.00
0.00 + 1.25x + x2 = 0 + 3.25
1.25x + x2 = 0 + 3.25

Combine like terms: 0 + 3.25 = 3.25
1.25x + x2 = 3.25

The x term is 1.25x.  Take half its coefficient (0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
1.25x + 0.390625 + x2 = 3.25 + 0.390625

Reorder the terms:
0.390625 + 1.25x + x2 = 3.25 + 0.390625

Combine like terms: 3.25 + 0.390625 = 3.640625
0.390625 + 1.25x + x2 = 3.640625

Factor a perfect square on the left side:
(x + 0.625)(x + 0.625) = 3.640625

Calculate the square root of the right side: 1.90804219

Break this problem into two subproblems by setting 
(x + 0.625) equal to 1.90804219 and -1.90804219.

Subproblem 1

x + 0.625 = 1.90804219 Simplifying x + 0.625 = 1.90804219 Reorder the terms: 0.625 + x = 1.90804219 Solving 0.625 + x = 1.90804219 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + x = 1.90804219 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = 1.90804219 + -0.625 x = 1.90804219 + -0.625 Combine like terms: 1.90804219 + -0.625 = 1.28304219 x = 1.28304219 Simplifying x = 1.28304219

Subproblem 2

x + 0.625 = -1.90804219 Simplifying x + 0.625 = -1.90804219 Reorder the terms: 0.625 + x = -1.90804219 Solving 0.625 + x = -1.90804219 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + x = -1.90804219 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = -1.90804219 + -0.625 x = -1.90804219 + -0.625 Combine like terms: -1.90804219 + -0.625 = -2.53304219 x = -2.53304219 Simplifying x = -2.53304219

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.28304219, -2.53304219}

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