x^2+6x+8=25

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Solution for x^2+6x+8=25 equation:


Simplifying
x2 + 6x + 8 = 25

Reorder the terms:
8 + 6x + x2 = 25

Solving
8 + 6x + x2 = 25

Solving for variable 'x'.

Reorder the terms:
8 + -25 + 6x + x2 = 25 + -25

Combine like terms: 8 + -25 = -17
-17 + 6x + x2 = 25 + -25

Combine like terms: 25 + -25 = 0
-17 + 6x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '17' to each side of the equation.
-17 + 6x + 17 + x2 = 0 + 17

Reorder the terms:
-17 + 17 + 6x + x2 = 0 + 17

Combine like terms: -17 + 17 = 0
0 + 6x + x2 = 0 + 17
6x + x2 = 0 + 17

Combine like terms: 0 + 17 = 17
6x + x2 = 17

The x term is 6x.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x + 9 + x2 = 17 + 9

Reorder the terms:
9 + 6x + x2 = 17 + 9

Combine like terms: 17 + 9 = 26
9 + 6x + x2 = 26

Factor a perfect square on the left side:
(x + 3)(x + 3) = 26

Calculate the square root of the right side: 5.099019514

Break this problem into two subproblems by setting 
(x + 3) equal to 5.099019514 and -5.099019514.

Subproblem 1

x + 3 = 5.099019514 Simplifying x + 3 = 5.099019514 Reorder the terms: 3 + x = 5.099019514 Solving 3 + x = 5.099019514 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 5.099019514 + -3 Combine like terms: 3 + -3 = 0 0 + x = 5.099019514 + -3 x = 5.099019514 + -3 Combine like terms: 5.099019514 + -3 = 2.099019514 x = 2.099019514 Simplifying x = 2.099019514

Subproblem 2

x + 3 = -5.099019514 Simplifying x + 3 = -5.099019514 Reorder the terms: 3 + x = -5.099019514 Solving 3 + x = -5.099019514 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = -5.099019514 + -3 Combine like terms: 3 + -3 = 0 0 + x = -5.099019514 + -3 x = -5.099019514 + -3 Combine like terms: -5.099019514 + -3 = -8.099019514 x = -8.099019514 Simplifying x = -8.099019514

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.099019514, -8.099019514}

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