(x*x)+x=55

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Solution for (x*x)+x=55 equation:


Simplifying
(x * x) + x = 55

Multiply x * x
(x2) + x = 55
x2 + x = 55

Reorder the terms:
x + x2 = 55

Solving
x + x2 = 55

Solving for variable 'x'.

Reorder the terms:
-55 + x + x2 = 55 + -55

Combine like terms: 55 + -55 = 0
-55 + x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '55' to each side of the equation.
-55 + x + 55 + x2 = 0 + 55

Reorder the terms:
-55 + 55 + x + x2 = 0 + 55

Combine like terms: -55 + 55 = 0
0 + x + x2 = 0 + 55
x + x2 = 0 + 55

Combine like terms: 0 + 55 = 55
x + x2 = 55

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 = 55 + 0.25

Reorder the terms:
0.25 + x + x2 = 55 + 0.25

Combine like terms: 55 + 0.25 = 55.25
0.25 + x + x2 = 55.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 55.25

Calculate the square root of the right side: 7.433034374

Break this problem into two subproblems by setting 
(x + 0.5) equal to 7.433034374 and -7.433034374.

Subproblem 1

x + 0.5 = 7.433034374 Simplifying x + 0.5 = 7.433034374 Reorder the terms: 0.5 + x = 7.433034374 Solving 0.5 + x = 7.433034374 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 = 7.433034374 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 7.433034374 + -0.5 x = 7.433034374 + -0.5 Combine like terms: 7.433034374 + -0.5 = 6.933034374 x = 6.933034374 Simplifying x = 6.933034374

Subproblem 2

x + 0.5 = -7.433034374 Simplifying x + 0.5 = -7.433034374 Reorder the terms: 0.5 + x = -7.433034374 Solving 0.5 + x = -7.433034374 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 = -7.433034374 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -7.433034374 + -0.5 x = -7.433034374 + -0.5 Combine like terms: -7.433034374 + -0.5 = -7.933034374 x = -7.933034374 Simplifying x = -7.933034374

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.933034374, -7.933034374}

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