x(x)+x(x+5)=26

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Solution for x(x)+x(x+5)=26 equation:


Simplifying
x(x) + x(x + 5) = 26

Multiply x * x
x2 + x(x + 5) = 26

Reorder the terms:
x2 + x(5 + x) = 26
x2 + (5 * x + x * x) = 26
x2 + (5x + x2) = 26

Reorder the terms:
5x + x2 + x2 = 26

Combine like terms: x2 + x2 = 2x2
5x + 2x2 = 26

Solving
5x + 2x2 = 26

Solving for variable 'x'.

Reorder the terms:
-26 + 5x + 2x2 = 26 + -26

Combine like terms: 26 + -26 = 0
-26 + 5x + 2x2 = 0

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

Divide each side by '2'.
-13 + 2.5x + x2 = 0

Move the constant term to the right:

Add '13' to each side of the equation.
-13 + 2.5x + 13 + x2 = 0 + 13

Reorder the terms:
-13 + 13 + 2.5x + x2 = 0 + 13

Combine like terms: -13 + 13 = 0
0 + 2.5x + x2 = 0 + 13
2.5x + x2 = 0 + 13

Combine like terms: 0 + 13 = 13
2.5x + x2 = 13

The x term is 2.5x.  Take half its coefficient (1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
2.5x + 1.5625 + x2 = 13 + 1.5625

Reorder the terms:
1.5625 + 2.5x + x2 = 13 + 1.5625

Combine like terms: 13 + 1.5625 = 14.5625
1.5625 + 2.5x + x2 = 14.5625

Factor a perfect square on the left side:
(x + 1.25)(x + 1.25) = 14.5625

Calculate the square root of the right side: 3.816084381

Break this problem into two subproblems by setting 
(x + 1.25) equal to 3.816084381 and -3.816084381.

Subproblem 1

x + 1.25 = 3.816084381 Simplifying x + 1.25 = 3.816084381 Reorder the terms: 1.25 + x = 3.816084381 Solving 1.25 + x = 3.816084381 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = 3.816084381 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = 3.816084381 + -1.25 x = 3.816084381 + -1.25 Combine like terms: 3.816084381 + -1.25 = 2.566084381 x = 2.566084381 Simplifying x = 2.566084381

Subproblem 2

x + 1.25 = -3.816084381 Simplifying x + 1.25 = -3.816084381 Reorder the terms: 1.25 + x = -3.816084381 Solving 1.25 + x = -3.816084381 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = -3.816084381 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = -3.816084381 + -1.25 x = -3.816084381 + -1.25 Combine like terms: -3.816084381 + -1.25 = -5.066084381 x = -5.066084381 Simplifying x = -5.066084381

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.566084381, -5.066084381}

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