(4+5x)(x+2)=180

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Solution for (4+5x)(x+2)=180 equation:


Simplifying
(4 + 5x)(x + 2) = 180

Reorder the terms:
(4 + 5x)(2 + x) = 180

Multiply (4 + 5x) * (2 + x)
(4(2 + x) + 5x * (2 + x)) = 180
((2 * 4 + x * 4) + 5x * (2 + x)) = 180
((8 + 4x) + 5x * (2 + x)) = 180
(8 + 4x + (2 * 5x + x * 5x)) = 180
(8 + 4x + (10x + 5x2)) = 180

Combine like terms: 4x + 10x = 14x
(8 + 14x + 5x2) = 180

Solving
8 + 14x + 5x2 = 180

Solving for variable 'x'.

Reorder the terms:
8 + -180 + 14x + 5x2 = 180 + -180

Combine like terms: 8 + -180 = -172
-172 + 14x + 5x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-172 + 14x + 5x2 = 0

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

Divide each side by '5'.
-34.4 + 2.8x + x2 = 0

Move the constant term to the right:

Add '34.4' to each side of the equation.
-34.4 + 2.8x + 34.4 + x2 = 0 + 34.4

Reorder the terms:
-34.4 + 34.4 + 2.8x + x2 = 0 + 34.4

Combine like terms: -34.4 + 34.4 = 0.0
0.0 + 2.8x + x2 = 0 + 34.4
2.8x + x2 = 0 + 34.4

Combine like terms: 0 + 34.4 = 34.4
2.8x + x2 = 34.4

The x term is 2.8x.  Take half its coefficient (1.4).
Square it (1.96) and add it to both sides.

Add '1.96' to each side of the equation.
2.8x + 1.96 + x2 = 34.4 + 1.96

Reorder the terms:
1.96 + 2.8x + x2 = 34.4 + 1.96

Combine like terms: 34.4 + 1.96 = 36.36
1.96 + 2.8x + x2 = 36.36

Factor a perfect square on the left side:
(x + 1.4)(x + 1.4) = 36.36

Calculate the square root of the right side: 6.029925373

Break this problem into two subproblems by setting 
(x + 1.4) equal to 6.029925373 and -6.029925373.

Subproblem 1

x + 1.4 = 6.029925373 Simplifying x + 1.4 = 6.029925373 Reorder the terms: 1.4 + x = 6.029925373 Solving 1.4 + x = 6.029925373 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.4' to each side of the equation. 1.4 + -1.4 + x = 6.029925373 + -1.4 Combine like terms: 1.4 + -1.4 = 0.0 0.0 + x = 6.029925373 + -1.4 x = 6.029925373 + -1.4 Combine like terms: 6.029925373 + -1.4 = 4.629925373 x = 4.629925373 Simplifying x = 4.629925373

Subproblem 2

x + 1.4 = -6.029925373 Simplifying x + 1.4 = -6.029925373 Reorder the terms: 1.4 + x = -6.029925373 Solving 1.4 + x = -6.029925373 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.4' to each side of the equation. 1.4 + -1.4 + x = -6.029925373 + -1.4 Combine like terms: 1.4 + -1.4 = 0.0 0.0 + x = -6.029925373 + -1.4 x = -6.029925373 + -1.4 Combine like terms: -6.029925373 + -1.4 = -7.429925373 x = -7.429925373 Simplifying x = -7.429925373

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.629925373, -7.429925373}

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