4x^2+28x-69=0

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Solution for 4x^2+28x-69=0 equation:


Simplifying
4x2 + 28x + -69 = 0

Reorder the terms:
-69 + 28x + 4x2 = 0

Solving
-69 + 28x + 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 + 7x + x2 = 0

Move the constant term to the right:

Add '17.25' to each side of the equation.
-17.25 + 7x + 17.25 + x2 = 0 + 17.25

Reorder the terms:
-17.25 + 17.25 + 7x + x2 = 0 + 17.25

Combine like terms: -17.25 + 17.25 = 0.00
0.00 + 7x + x2 = 0 + 17.25
7x + x2 = 0 + 17.25

Combine like terms: 0 + 17.25 = 17.25
7x + x2 = 17.25

The x term is 7x.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7x + 12.25 + x2 = 17.25 + 12.25

Reorder the terms:
12.25 + 7x + x2 = 17.25 + 12.25

Combine like terms: 17.25 + 12.25 = 29.5
12.25 + 7x + x2 = 29.5

Factor a perfect square on the left side:
(x + 3.5)(x + 3.5) = 29.5

Calculate the square root of the right side: 5.431390246

Break this problem into two subproblems by setting 
(x + 3.5) equal to 5.431390246 and -5.431390246.

Subproblem 1

x + 3.5 = 5.431390246 Simplifying x + 3.5 = 5.431390246 Reorder the terms: 3.5 + x = 5.431390246 Solving 3.5 + x = 5.431390246 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = 5.431390246 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = 5.431390246 + -3.5 x = 5.431390246 + -3.5 Combine like terms: 5.431390246 + -3.5 = 1.931390246 x = 1.931390246 Simplifying x = 1.931390246

Subproblem 2

x + 3.5 = -5.431390246 Simplifying x + 3.5 = -5.431390246 Reorder the terms: 3.5 + x = -5.431390246 Solving 3.5 + x = -5.431390246 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = -5.431390246 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = -5.431390246 + -3.5 x = -5.431390246 + -3.5 Combine like terms: -5.431390246 + -3.5 = -8.931390246 x = -8.931390246 Simplifying x = -8.931390246

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.931390246, -8.931390246}

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