71.1=x+x^2

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Solution for 71.1=x+x^2 equation:


Simplifying
71.1 = x + x2

Solving
71.1 = x + x2

Solving for variable 'x'.

Reorder the terms:
71.1 + -1x + -1x2 = x + -1x + x2 + -1x2

Combine like terms: x + -1x = 0
71.1 + -1x + -1x2 = 0 + x2 + -1x2
71.1 + -1x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
71.1 + -1x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-71.1 + x + x2 = 0

Move the constant term to the right:

Add '71.1' to each side of the equation.
-71.1 + x + 71.1 + x2 = 0 + 71.1

Reorder the terms:
-71.1 + 71.1 + x + x2 = 0 + 71.1

Combine like terms: -71.1 + 71.1 = 0.0
0.0 + x + x2 = 0 + 71.1
x + x2 = 0 + 71.1

Combine like terms: 0 + 71.1 = 71.1
x + x2 = 71.1

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.
 + 0.25 + x2 = 71.1 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 71.1 + 0.25

Combine like terms: 71.1 + 0.25 = 71.35
1.25 + x2 = 71.35

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 71.35

Calculate the square root of the right side: 8.44689292

Break this problem into two subproblems by setting 
(x + 0.5) equal to 8.44689292 and -8.44689292.

Subproblem 1

x + 0.5 = 8.44689292 Simplifying x + 0.5 = 8.44689292 Reorder the terms: 0.5 + x = 8.44689292 Solving 0.5 + x = 8.44689292 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 = 8.44689292 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 8.44689292 + -0.5 x = 8.44689292 + -0.5 Combine like terms: 8.44689292 + -0.5 = 7.94689292 x = 7.94689292 Simplifying x = 7.94689292

Subproblem 2

x + 0.5 = -8.44689292 Simplifying x + 0.5 = -8.44689292 Reorder the terms: 0.5 + x = -8.44689292 Solving 0.5 + x = -8.44689292 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 = -8.44689292 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -8.44689292 + -0.5 x = -8.44689292 + -0.5 Combine like terms: -8.44689292 + -0.5 = -8.94689292 x = -8.94689292 Simplifying x = -8.94689292

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.94689292, -8.94689292}

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