4x^2+8x-69=0

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Solution for 4x^2+8x-69=0 equation:


Simplifying
4x2 + 8x + -69 = 0

Reorder the terms:
-69 + 8x + 4x2 = 0

Solving
-69 + 8x + 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'.
-17.25 + 2x + x2 = 0

Move the constant term to the right:

Add '17.25' to each side of the equation.
-17.25 + 2x + 17.25 + x2 = 0 + 17.25

Reorder the terms:
-17.25 + 17.25 + 2x + x2 = 0 + 17.25

Combine like terms: -17.25 + 17.25 = 0.00
0.00 + 2x + x2 = 0 + 17.25
2x + x2 = 0 + 17.25

Combine like terms: 0 + 17.25 = 17.25
2x + x2 = 17.25

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 17.25 + 1

Reorder the terms:
1 + 2x + x2 = 17.25 + 1

Combine like terms: 17.25 + 1 = 18.25
1 + 2x + x2 = 18.25

Factor a perfect square on the left side:
(x + 1)(x + 1) = 18.25

Calculate the square root of the right side: 4.272001873

Break this problem into two subproblems by setting 
(x + 1) equal to 4.272001873 and -4.272001873.

Subproblem 1

x + 1 = 4.272001873 Simplifying x + 1 = 4.272001873 Reorder the terms: 1 + x = 4.272001873 Solving 1 + x = 4.272001873 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 4.272001873 + -1 Combine like terms: 1 + -1 = 0 0 + x = 4.272001873 + -1 x = 4.272001873 + -1 Combine like terms: 4.272001873 + -1 = 3.272001873 x = 3.272001873 Simplifying x = 3.272001873

Subproblem 2

x + 1 = -4.272001873 Simplifying x + 1 = -4.272001873 Reorder the terms: 1 + x = -4.272001873 Solving 1 + x = -4.272001873 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -4.272001873 + -1 Combine like terms: 1 + -1 = 0 0 + x = -4.272001873 + -1 x = -4.272001873 + -1 Combine like terms: -4.272001873 + -1 = -5.272001873 x = -5.272001873 Simplifying x = -5.272001873

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.272001873, -5.272001873}

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