(x+5)(x+5)=20

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Solution for (x+5)(x+5)=20 equation:


Simplifying
(x + 5)(x + 5) = 20

Reorder the terms:
(5 + x)(x + 5) = 20

Reorder the terms:
(5 + x)(5 + x) = 20

Multiply (5 + x) * (5 + x)
(5(5 + x) + x(5 + x)) = 20
((5 * 5 + x * 5) + x(5 + x)) = 20
((25 + 5x) + x(5 + x)) = 20
(25 + 5x + (5 * x + x * x)) = 20
(25 + 5x + (5x + x2)) = 20

Combine like terms: 5x + 5x = 10x
(25 + 10x + x2) = 20

Solving
25 + 10x + x2 = 20

Solving for variable 'x'.

Reorder the terms:
25 + -20 + 10x + x2 = 20 + -20

Combine like terms: 25 + -20 = 5
5 + 10x + x2 = 20 + -20

Combine like terms: 20 + -20 = 0
5 + 10x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-5' to each side of the equation.
5 + 10x + -5 + x2 = 0 + -5

Reorder the terms:
5 + -5 + 10x + x2 = 0 + -5

Combine like terms: 5 + -5 = 0
0 + 10x + x2 = 0 + -5
10x + x2 = 0 + -5

Combine like terms: 0 + -5 = -5
10x + x2 = -5

The x term is 10x.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10x + 25 + x2 = -5 + 25

Reorder the terms:
25 + 10x + x2 = -5 + 25

Combine like terms: -5 + 25 = 20
25 + 10x + x2 = 20

Factor a perfect square on the left side:
(x + 5)(x + 5) = 20

Calculate the square root of the right side: 4.472135955

Break this problem into two subproblems by setting 
(x + 5) equal to 4.472135955 and -4.472135955.

Subproblem 1

x + 5 = 4.472135955 Simplifying x + 5 = 4.472135955 Reorder the terms: 5 + x = 4.472135955 Solving 5 + x = 4.472135955 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = 4.472135955 + -5 Combine like terms: 5 + -5 = 0 0 + x = 4.472135955 + -5 x = 4.472135955 + -5 Combine like terms: 4.472135955 + -5 = -0.527864045 x = -0.527864045 Simplifying x = -0.527864045

Subproblem 2

x + 5 = -4.472135955 Simplifying x + 5 = -4.472135955 Reorder the terms: 5 + x = -4.472135955 Solving 5 + x = -4.472135955 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = -4.472135955 + -5 Combine like terms: 5 + -5 = 0 0 + x = -4.472135955 + -5 x = -4.472135955 + -5 Combine like terms: -4.472135955 + -5 = -9.472135955 x = -9.472135955 Simplifying x = -9.472135955

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.527864045, -9.472135955}

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