(3x+8)+4x(x+4)=180

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Solution for (3x+8)+4x(x+4)=180 equation:


Simplifying
(3x + 8) + 4x(x + 4) = 180

Reorder the terms:
(8 + 3x) + 4x(x + 4) = 180

Remove parenthesis around (8 + 3x)
8 + 3x + 4x(x + 4) = 180

Reorder the terms:
8 + 3x + 4x(4 + x) = 180
8 + 3x + (4 * 4x + x * 4x) = 180
8 + 3x + (16x + 4x2) = 180

Combine like terms: 3x + 16x = 19x
8 + 19x + 4x2 = 180

Solving
8 + 19x + 4x2 = 180

Solving for variable 'x'.

Reorder the terms:
8 + -180 + 19x + 4x2 = 180 + -180

Combine like terms: 8 + -180 = -172
-172 + 19x + 4x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-172 + 19x + 4x2 = 0

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

Divide each side by '4'.
-43 + 4.75x + x2 = 0

Move the constant term to the right:

Add '43' to each side of the equation.
-43 + 4.75x + 43 + x2 = 0 + 43

Reorder the terms:
-43 + 43 + 4.75x + x2 = 0 + 43

Combine like terms: -43 + 43 = 0
0 + 4.75x + x2 = 0 + 43
4.75x + x2 = 0 + 43

Combine like terms: 0 + 43 = 43
4.75x + x2 = 43

The x term is 4.75x.  Take half its coefficient (2.375).
Square it (5.640625) and add it to both sides.

Add '5.640625' to each side of the equation.
4.75x + 5.640625 + x2 = 43 + 5.640625

Reorder the terms:
5.640625 + 4.75x + x2 = 43 + 5.640625

Combine like terms: 43 + 5.640625 = 48.640625
5.640625 + 4.75x + x2 = 48.640625

Factor a perfect square on the left side:
(x + 2.375)(x + 2.375) = 48.640625

Calculate the square root of the right side: 6.974283117

Break this problem into two subproblems by setting 
(x + 2.375) equal to 6.974283117 and -6.974283117.

Subproblem 1

x + 2.375 = 6.974283117 Simplifying x + 2.375 = 6.974283117 Reorder the terms: 2.375 + x = 6.974283117 Solving 2.375 + x = 6.974283117 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.375' to each side of the equation. 2.375 + -2.375 + x = 6.974283117 + -2.375 Combine like terms: 2.375 + -2.375 = 0.000 0.000 + x = 6.974283117 + -2.375 x = 6.974283117 + -2.375 Combine like terms: 6.974283117 + -2.375 = 4.599283117 x = 4.599283117 Simplifying x = 4.599283117

Subproblem 2

x + 2.375 = -6.974283117 Simplifying x + 2.375 = -6.974283117 Reorder the terms: 2.375 + x = -6.974283117 Solving 2.375 + x = -6.974283117 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.375' to each side of the equation. 2.375 + -2.375 + x = -6.974283117 + -2.375 Combine like terms: 2.375 + -2.375 = 0.000 0.000 + x = -6.974283117 + -2.375 x = -6.974283117 + -2.375 Combine like terms: -6.974283117 + -2.375 = -9.349283117 x = -9.349283117 Simplifying x = -9.349283117

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.599283117, -9.349283117}

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