x+x^2=8.5

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Solution for x+x^2=8.5 equation:


Simplifying
x + x2 = 8.5

Solving
x + x2 = 8.5

Solving for variable 'x'.

Reorder the terms:
-8.5 + x + x2 = 8.5 + -8.5

Combine like terms: 8.5 + -8.5 = 0.0
-8.5 + x + x2 = 0.0

Begin completing the square.

Move the constant term to the right:

Add '8.5' to each side of the equation.
-8.5 + x + 8.5 + x2 = 0.0 + 8.5

Reorder the terms:
-8.5 + 8.5 + x + x2 = 0.0 + 8.5

Combine like terms: -8.5 + 8.5 = 0.0
0.0 + x + x2 = 0.0 + 8.5
x + x2 = 0.0 + 8.5

Combine like terms: 0.0 + 8.5 = 8.5
x + x2 = 8.5

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 = 8.5 + 0.25

Reorder the terms:
0.25 + x + x2 = 8.5 + 0.25

Combine like terms: 8.5 + 0.25 = 8.75
0.25 + x + x2 = 8.75

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 8.75

Calculate the square root of the right side: 2.958039892

Break this problem into two subproblems by setting 
(x + 0.5) equal to 2.958039892 and -2.958039892.

Subproblem 1

x + 0.5 = 2.958039892 Simplifying x + 0.5 = 2.958039892 Reorder the terms: 0.5 + x = 2.958039892 Solving 0.5 + x = 2.958039892 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 = 2.958039892 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 2.958039892 + -0.5 x = 2.958039892 + -0.5 Combine like terms: 2.958039892 + -0.5 = 2.458039892 x = 2.458039892 Simplifying x = 2.458039892

Subproblem 2

x + 0.5 = -2.958039892 Simplifying x + 0.5 = -2.958039892 Reorder the terms: 0.5 + x = -2.958039892 Solving 0.5 + x = -2.958039892 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 = -2.958039892 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -2.958039892 + -0.5 x = -2.958039892 + -0.5 Combine like terms: -2.958039892 + -0.5 = -3.458039892 x = -3.458039892 Simplifying x = -3.458039892

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.458039892, -3.458039892}

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