(x)(28+4x)=73

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Solution for (x)(28+4x)=73 equation:


Simplifying
(x)(28 + 4x) = 73
(28 * x + 4x * x) = 73
(28x + 4x2) = 73

Solving
28x + 4x2 = 73

Solving for variable 'x'.

Reorder the terms:
-73 + 28x + 4x2 = 73 + -73

Combine like terms: 73 + -73 = 0
-73 + 28x + 4x2 = 0

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

Divide each side by '4'.
-18.25 + 7x + x2 = 0

Move the constant term to the right:

Add '18.25' to each side of the equation.
-18.25 + 7x + 18.25 + x2 = 0 + 18.25

Reorder the terms:
-18.25 + 18.25 + 7x + x2 = 0 + 18.25

Combine like terms: -18.25 + 18.25 = 0.00
0.00 + 7x + x2 = 0 + 18.25
7x + x2 = 0 + 18.25

Combine like terms: 0 + 18.25 = 18.25
7x + x2 = 18.25

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 = 18.25 + 12.25

Reorder the terms:
12.25 + 7x + x2 = 18.25 + 12.25

Combine like terms: 18.25 + 12.25 = 30.5
12.25 + 7x + x2 = 30.5

Factor a perfect square on the left side:
(x + 3.5)(x + 3.5) = 30.5

Calculate the square root of the right side: 5.522680509

Break this problem into two subproblems by setting 
(x + 3.5) equal to 5.522680509 and -5.522680509.

Subproblem 1

x + 3.5 = 5.522680509 Simplifying x + 3.5 = 5.522680509 Reorder the terms: 3.5 + x = 5.522680509 Solving 3.5 + x = 5.522680509 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 = 5.522680509 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = 5.522680509 + -3.5 x = 5.522680509 + -3.5 Combine like terms: 5.522680509 + -3.5 = 2.022680509 x = 2.022680509 Simplifying x = 2.022680509

Subproblem 2

x + 3.5 = -5.522680509 Simplifying x + 3.5 = -5.522680509 Reorder the terms: 3.5 + x = -5.522680509 Solving 3.5 + x = -5.522680509 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 = -5.522680509 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = -5.522680509 + -3.5 x = -5.522680509 + -3.5 Combine like terms: -5.522680509 + -3.5 = -9.022680509 x = -9.022680509 Simplifying x = -9.022680509

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.022680509, -9.022680509}

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