(x*x)+x=26

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Solution for (x*x)+x=26 equation:


Simplifying
(x * x) + x = 26

Multiply x * x
(x2) + x = 26
x2 + x = 26

Reorder the terms:
x + x2 = 26

Solving
x + x2 = 26

Solving for variable 'x'.

Reorder the terms:
-26 + x + x2 = 26 + -26

Combine like terms: 26 + -26 = 0
-26 + x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '26' to each side of the equation.
-26 + x + 26 + x2 = 0 + 26

Reorder the terms:
-26 + 26 + x + x2 = 0 + 26

Combine like terms: -26 + 26 = 0
0 + x + x2 = 0 + 26
x + x2 = 0 + 26

Combine like terms: 0 + 26 = 26
x + x2 = 26

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 = 26 + 0.25

Reorder the terms:
0.25 + x + x2 = 26 + 0.25

Combine like terms: 26 + 0.25 = 26.25
0.25 + x + x2 = 26.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 26.25

Calculate the square root of the right side: 5.123475383

Break this problem into two subproblems by setting 
(x + 0.5) equal to 5.123475383 and -5.123475383.

Subproblem 1

x + 0.5 = 5.123475383 Simplifying x + 0.5 = 5.123475383 Reorder the terms: 0.5 + x = 5.123475383 Solving 0.5 + x = 5.123475383 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 = 5.123475383 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 5.123475383 + -0.5 x = 5.123475383 + -0.5 Combine like terms: 5.123475383 + -0.5 = 4.623475383 x = 4.623475383 Simplifying x = 4.623475383

Subproblem 2

x + 0.5 = -5.123475383 Simplifying x + 0.5 = -5.123475383 Reorder the terms: 0.5 + x = -5.123475383 Solving 0.5 + x = -5.123475383 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 = -5.123475383 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -5.123475383 + -0.5 x = -5.123475383 + -0.5 Combine like terms: -5.123475383 + -0.5 = -5.623475383 x = -5.623475383 Simplifying x = -5.623475383

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.623475383, -5.623475383}

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