(x+10)(x+5)=180

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Solution for (x+10)(x+5)=180 equation:


Simplifying
(x + 10)(x + 5) = 180

Reorder the terms:
(10 + x)(x + 5) = 180

Reorder the terms:
(10 + x)(5 + x) = 180

Multiply (10 + x) * (5 + x)
(10(5 + x) + x(5 + x)) = 180
((5 * 10 + x * 10) + x(5 + x)) = 180
((50 + 10x) + x(5 + x)) = 180
(50 + 10x + (5 * x + x * x)) = 180
(50 + 10x + (5x + x2)) = 180

Combine like terms: 10x + 5x = 15x
(50 + 15x + x2) = 180

Solving
50 + 15x + x2 = 180

Solving for variable 'x'.

Reorder the terms:
50 + -180 + 15x + x2 = 180 + -180

Combine like terms: 50 + -180 = -130
-130 + 15x + x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-130 + 15x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '130' to each side of the equation.
-130 + 15x + 130 + x2 = 0 + 130

Reorder the terms:
-130 + 130 + 15x + x2 = 0 + 130

Combine like terms: -130 + 130 = 0
0 + 15x + x2 = 0 + 130
15x + x2 = 0 + 130

Combine like terms: 0 + 130 = 130
15x + x2 = 130

The x term is 15x.  Take half its coefficient (7.5).
Square it (56.25) and add it to both sides.

Add '56.25' to each side of the equation.
15x + 56.25 + x2 = 130 + 56.25

Reorder the terms:
56.25 + 15x + x2 = 130 + 56.25

Combine like terms: 130 + 56.25 = 186.25
56.25 + 15x + x2 = 186.25

Factor a perfect square on the left side:
(x + 7.5)(x + 7.5) = 186.25

Calculate the square root of the right side: 13.647344064

Break this problem into two subproblems by setting 
(x + 7.5) equal to 13.647344064 and -13.647344064.

Subproblem 1

x + 7.5 = 13.647344064 Simplifying x + 7.5 = 13.647344064 Reorder the terms: 7.5 + x = 13.647344064 Solving 7.5 + x = 13.647344064 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7.5' to each side of the equation. 7.5 + -7.5 + x = 13.647344064 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = 13.647344064 + -7.5 x = 13.647344064 + -7.5 Combine like terms: 13.647344064 + -7.5 = 6.147344064 x = 6.147344064 Simplifying x = 6.147344064

Subproblem 2

x + 7.5 = -13.647344064 Simplifying x + 7.5 = -13.647344064 Reorder the terms: 7.5 + x = -13.647344064 Solving 7.5 + x = -13.647344064 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7.5' to each side of the equation. 7.5 + -7.5 + x = -13.647344064 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = -13.647344064 + -7.5 x = -13.647344064 + -7.5 Combine like terms: -13.647344064 + -7.5 = -21.147344064 x = -21.147344064 Simplifying x = -21.147344064

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.147344064, -21.147344064}

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