4x^2+26x-9=0

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Solution for 4x^2+26x-9=0 equation:


Simplifying
4x2 + 26x + -9 = 0

Reorder the terms:
-9 + 26x + 4x2 = 0

Solving
-9 + 26x + 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'.
-2.25 + 6.5x + x2 = 0

Move the constant term to the right:

Add '2.25' to each side of the equation.
-2.25 + 6.5x + 2.25 + x2 = 0 + 2.25

Reorder the terms:
-2.25 + 2.25 + 6.5x + x2 = 0 + 2.25

Combine like terms: -2.25 + 2.25 = 0.00
0.00 + 6.5x + x2 = 0 + 2.25
6.5x + x2 = 0 + 2.25

Combine like terms: 0 + 2.25 = 2.25
6.5x + x2 = 2.25

The x term is 6.5x.  Take half its coefficient (3.25).
Square it (10.5625) and add it to both sides.

Add '10.5625' to each side of the equation.
6.5x + 10.5625 + x2 = 2.25 + 10.5625

Reorder the terms:
10.5625 + 6.5x + x2 = 2.25 + 10.5625

Combine like terms: 2.25 + 10.5625 = 12.8125
10.5625 + 6.5x + x2 = 12.8125

Factor a perfect square on the left side:
(x + 3.25)(x + 3.25) = 12.8125

Calculate the square root of the right side: 3.579455266

Break this problem into two subproblems by setting 
(x + 3.25) equal to 3.579455266 and -3.579455266.

Subproblem 1

x + 3.25 = 3.579455266 Simplifying x + 3.25 = 3.579455266 Reorder the terms: 3.25 + x = 3.579455266 Solving 3.25 + x = 3.579455266 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.25' to each side of the equation. 3.25 + -3.25 + x = 3.579455266 + -3.25 Combine like terms: 3.25 + -3.25 = 0.00 0.00 + x = 3.579455266 + -3.25 x = 3.579455266 + -3.25 Combine like terms: 3.579455266 + -3.25 = 0.329455266 x = 0.329455266 Simplifying x = 0.329455266

Subproblem 2

x + 3.25 = -3.579455266 Simplifying x + 3.25 = -3.579455266 Reorder the terms: 3.25 + x = -3.579455266 Solving 3.25 + x = -3.579455266 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.25' to each side of the equation. 3.25 + -3.25 + x = -3.579455266 + -3.25 Combine like terms: 3.25 + -3.25 = 0.00 0.00 + x = -3.579455266 + -3.25 x = -3.579455266 + -3.25 Combine like terms: -3.579455266 + -3.25 = -6.829455266 x = -6.829455266 Simplifying x = -6.829455266

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.329455266, -6.829455266}

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