(x*x)+(x+5)(x+5)=200

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Solution for (x*x)+(x+5)(x+5)=200 equation:


Simplifying
(x * x) + (x + 5)(x + 5) = 200

Multiply x * x
(x2) + (x + 5)(x + 5) = 200
x2 + (x + 5)(x + 5) = 200

Reorder the terms:
x2 + (5 + x)(x + 5) = 200

Reorder the terms:
x2 + (5 + x)(5 + x) = 200

Multiply (5 + x) * (5 + x)
x2 + (5(5 + x) + x(5 + x)) = 200
x2 + ((5 * 5 + x * 5) + x(5 + x)) = 200
x2 + ((25 + 5x) + x(5 + x)) = 200
x2 + (25 + 5x + (5 * x + x * x)) = 200
x2 + (25 + 5x + (5x + x2)) = 200

Combine like terms: 5x + 5x = 10x
x2 + (25 + 10x + x2) = 200

Reorder the terms:
25 + 10x + x2 + x2 = 200

Combine like terms: x2 + x2 = 2x2
25 + 10x + 2x2 = 200

Solving
25 + 10x + 2x2 = 200

Solving for variable 'x'.

Reorder the terms:
25 + -200 + 10x + 2x2 = 200 + -200

Combine like terms: 25 + -200 = -175
-175 + 10x + 2x2 = 200 + -200

Combine like terms: 200 + -200 = 0
-175 + 10x + 2x2 = 0

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

Divide each side by '2'.
-87.5 + 5x + x2 = 0

Move the constant term to the right:

Add '87.5' to each side of the equation.
-87.5 + 5x + 87.5 + x2 = 0 + 87.5

Reorder the terms:
-87.5 + 87.5 + 5x + x2 = 0 + 87.5

Combine like terms: -87.5 + 87.5 = 0.0
0.0 + 5x + x2 = 0 + 87.5
5x + x2 = 0 + 87.5

Combine like terms: 0 + 87.5 = 87.5
5x + x2 = 87.5

The x term is 5x.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5x + 6.25 + x2 = 87.5 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 87.5 + 6.25

Combine like terms: 87.5 + 6.25 = 93.75
6.25 + 5x + x2 = 93.75

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 93.75

Calculate the square root of the right side: 9.682458366

Break this problem into two subproblems by setting 
(x + 2.5) equal to 9.682458366 and -9.682458366.

Subproblem 1

x + 2.5 = 9.682458366 Simplifying x + 2.5 = 9.682458366 Reorder the terms: 2.5 + x = 9.682458366 Solving 2.5 + x = 9.682458366 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = 9.682458366 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 9.682458366 + -2.5 x = 9.682458366 + -2.5 Combine like terms: 9.682458366 + -2.5 = 7.182458366 x = 7.182458366 Simplifying x = 7.182458366

Subproblem 2

x + 2.5 = -9.682458366 Simplifying x + 2.5 = -9.682458366 Reorder the terms: 2.5 + x = -9.682458366 Solving 2.5 + x = -9.682458366 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = -9.682458366 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -9.682458366 + -2.5 x = -9.682458366 + -2.5 Combine like terms: -9.682458366 + -2.5 = -12.182458366 x = -12.182458366 Simplifying x = -12.182458366

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.182458366, -12.182458366}

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