x^2+85=189-x

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Solution for x^2+85=189-x equation:


Simplifying
x2 + 85 = 189 + -1x

Reorder the terms:
85 + x2 = 189 + -1x

Solving
85 + x2 = 189 + -1x

Solving for variable 'x'.

Reorder the terms:
85 + -189 + x + x2 = 189 + -1x + -189 + x

Combine like terms: 85 + -189 = -104
-104 + x + x2 = 189 + -1x + -189 + x

Reorder the terms:
-104 + x + x2 = 189 + -189 + -1x + x

Combine like terms: 189 + -189 = 0
-104 + x + x2 = 0 + -1x + x
-104 + x + x2 = -1x + x

Combine like terms: -1x + x = 0
-104 + x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '104' to each side of the equation.
-104 + x + 104 + x2 = 0 + 104

Reorder the terms:
-104 + 104 + x + x2 = 0 + 104

Combine like terms: -104 + 104 = 0
0 + x + x2 = 0 + 104
x + x2 = 0 + 104

Combine like terms: 0 + 104 = 104
x + x2 = 104

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
x + 0.25 + x2 = 104 + 0.25

Reorder the terms:
0.25 + x + x2 = 104 + 0.25

Combine like terms: 104 + 0.25 = 104.25
0.25 + x + x2 = 104.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 104.25

Calculate the square root of the right side: 10.210288928

Break this problem into two subproblems by setting 
(x + 0.5) equal to 10.210288928 and -10.210288928.

Subproblem 1

x + 0.5 = 10.210288928 Simplifying x + 0.5 = 10.210288928 Reorder the terms: 0.5 + x = 10.210288928 Solving 0.5 + x = 10.210288928 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 10.210288928 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 10.210288928 + -0.5 x = 10.210288928 + -0.5 Combine like terms: 10.210288928 + -0.5 = 9.710288928 x = 9.710288928 Simplifying x = 9.710288928

Subproblem 2

x + 0.5 = -10.210288928 Simplifying x + 0.5 = -10.210288928 Reorder the terms: 0.5 + x = -10.210288928 Solving 0.5 + x = -10.210288928 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -10.210288928 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -10.210288928 + -0.5 x = -10.210288928 + -0.5 Combine like terms: -10.210288928 + -0.5 = -10.710288928 x = -10.710288928 Simplifying x = -10.710288928

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.710288928, -10.710288928}

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