x^2+5x+10=26

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Solution for x^2+5x+10=26 equation:


Simplifying
x2 + 5x + 10 = 26

Reorder the terms:
10 + 5x + x2 = 26

Solving
10 + 5x + x2 = 26

Solving for variable 'x'.

Reorder the terms:
10 + -26 + 5x + x2 = 26 + -26

Combine like terms: 10 + -26 = -16
-16 + 5x + x2 = 26 + -26

Combine like terms: 26 + -26 = 0
-16 + 5x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + 5x + 16 + x2 = 0 + 16

Reorder the terms:
-16 + 16 + 5x + x2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + 5x + x2 = 0 + 16
5x + x2 = 0 + 16

Combine like terms: 0 + 16 = 16
5x + x2 = 16

The x term is 5x.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5x + 6.25 + x2 = 16 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 16 + 6.25

Combine like terms: 16 + 6.25 = 22.25
6.25 + 5x + x2 = 22.25

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 22.25

Calculate the square root of the right side: 4.716990566

Break this problem into two subproblems by setting 
(x + 2.5) equal to 4.716990566 and -4.716990566.

Subproblem 1

x + 2.5 = 4.716990566 Simplifying x + 2.5 = 4.716990566 Reorder the terms: 2.5 + x = 4.716990566 Solving 2.5 + x = 4.716990566 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = 4.716990566 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 4.716990566 + -2.5 x = 4.716990566 + -2.5 Combine like terms: 4.716990566 + -2.5 = 2.216990566 x = 2.216990566 Simplifying x = 2.216990566

Subproblem 2

x + 2.5 = -4.716990566 Simplifying x + 2.5 = -4.716990566 Reorder the terms: 2.5 + x = -4.716990566 Solving 2.5 + x = -4.716990566 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = -4.716990566 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -4.716990566 + -2.5 x = -4.716990566 + -2.5 Combine like terms: -4.716990566 + -2.5 = -7.216990566 x = -7.216990566 Simplifying x = -7.216990566

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.216990566, -7.216990566}

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