4x(x+7)=-23

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Solution for 4x(x+7)=-23 equation:


Simplifying
4x(x + 7) = -23

Reorder the terms:
4x(7 + x) = -23
(7 * 4x + x * 4x) = -23
(28x + 4x2) = -23

Solving
28x + 4x2 = -23

Solving for variable 'x'.

Reorder the terms:
23 + 28x + 4x2 = -23 + 23

Combine like terms: -23 + 23 = 0
23 + 28x + 4x2 = 0

Begin completing the square.  Divide all terms by
4 the coefficient of the squared term: 

Divide each side by '4'.
5.75 + 7x + x2 = 0

Move the constant term to the right:

Add '-5.75' to each side of the equation.
5.75 + 7x + -5.75 + x2 = 0 + -5.75

Reorder the terms:
5.75 + -5.75 + 7x + x2 = 0 + -5.75

Combine like terms: 5.75 + -5.75 = 0.00
0.00 + 7x + x2 = 0 + -5.75
7x + x2 = 0 + -5.75

Combine like terms: 0 + -5.75 = -5.75
7x + x2 = -5.75

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 = -5.75 + 12.25

Reorder the terms:
12.25 + 7x + x2 = -5.75 + 12.25

Combine like terms: -5.75 + 12.25 = 6.5
12.25 + 7x + x2 = 6.5

Factor a perfect square on the left side:
(x + 3.5)(x + 3.5) = 6.5

Calculate the square root of the right side: 2.549509757

Break this problem into two subproblems by setting 
(x + 3.5) equal to 2.549509757 and -2.549509757.

Subproblem 1

x + 3.5 = 2.549509757 Simplifying x + 3.5 = 2.549509757 Reorder the terms: 3.5 + x = 2.549509757 Solving 3.5 + x = 2.549509757 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 = 2.549509757 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = 2.549509757 + -3.5 x = 2.549509757 + -3.5 Combine like terms: 2.549509757 + -3.5 = -0.950490243 x = -0.950490243 Simplifying x = -0.950490243

Subproblem 2

x + 3.5 = -2.549509757 Simplifying x + 3.5 = -2.549509757 Reorder the terms: 3.5 + x = -2.549509757 Solving 3.5 + x = -2.549509757 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 = -2.549509757 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = -2.549509757 + -3.5 x = -2.549509757 + -3.5 Combine like terms: -2.549509757 + -3.5 = -6.049509757 x = -6.049509757 Simplifying x = -6.049509757

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.950490243, -6.049509757}

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