X^2+15X+6=0

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Solution for X^2+15X+6=0 equation:


Simplifying
X2 + 15X + 6 = 0

Reorder the terms:
6 + 15X + X2 = 0

Solving
6 + 15X + X2 = 0

Solving for variable 'X'.

Begin completing the square.

Move the constant term to the right:

Add '-6' to each side of the equation.
6 + 15X + -6 + X2 = 0 + -6

Reorder the terms:
6 + -6 + 15X + X2 = 0 + -6

Combine like terms: 6 + -6 = 0
0 + 15X + X2 = 0 + -6
15X + X2 = 0 + -6

Combine like terms: 0 + -6 = -6
15X + X2 = -6

The X term is 15X.  Take half its coefficient (7.5).
Square it (56.25) and add it to both sides.

Add '56.25' to each side of the equation.
15X + 56.25 + X2 = -6 + 56.25

Reorder the terms:
56.25 + 15X + X2 = -6 + 56.25

Combine like terms: -6 + 56.25 = 50.25
56.25 + 15X + X2 = 50.25

Factor a perfect square on the left side:
(X + 7.5)(X + 7.5) = 50.25

Calculate the square root of the right side: 7.088723439

Break this problem into two subproblems by setting 
(X + 7.5) equal to 7.088723439 and -7.088723439.

Subproblem 1

X + 7.5 = 7.088723439 Simplifying X + 7.5 = 7.088723439 Reorder the terms: 7.5 + X = 7.088723439 Solving 7.5 + X = 7.088723439 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-7.5' to each side of the equation. 7.5 + -7.5 + X = 7.088723439 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + X = 7.088723439 + -7.5 X = 7.088723439 + -7.5 Combine like terms: 7.088723439 + -7.5 = -0.411276561 X = -0.411276561 Simplifying X = -0.411276561

Subproblem 2

X + 7.5 = -7.088723439 Simplifying X + 7.5 = -7.088723439 Reorder the terms: 7.5 + X = -7.088723439 Solving 7.5 + X = -7.088723439 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-7.5' to each side of the equation. 7.5 + -7.5 + X = -7.088723439 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + X = -7.088723439 + -7.5 X = -7.088723439 + -7.5 Combine like terms: -7.088723439 + -7.5 = -14.588723439 X = -14.588723439 Simplifying X = -14.588723439

Solution

The solution to the problem is based on the solutions from the subproblems. X = {-0.411276561, -14.588723439}

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