x^2+15x+10=0

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Solution for x^2+15x+10=0 equation:


Simplifying
x2 + 15x + 10 = 0

Reorder the terms:
10 + 15x + x2 = 0

Solving
10 + 15x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-10' to each side of the equation.
10 + 15x + -10 + x2 = 0 + -10

Reorder the terms:
10 + -10 + 15x + x2 = 0 + -10

Combine like terms: 10 + -10 = 0
0 + 15x + x2 = 0 + -10
15x + x2 = 0 + -10

Combine like terms: 0 + -10 = -10
15x + x2 = -10

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 = -10 + 56.25

Reorder the terms:
56.25 + 15x + x2 = -10 + 56.25

Combine like terms: -10 + 56.25 = 46.25
56.25 + 15x + x2 = 46.25

Factor a perfect square on the left side:
(x + 7.5)(x + 7.5) = 46.25

Calculate the square root of the right side: 6.800735254

Break this problem into two subproblems by setting 
(x + 7.5) equal to 6.800735254 and -6.800735254.

Subproblem 1

x + 7.5 = 6.800735254 Simplifying x + 7.5 = 6.800735254 Reorder the terms: 7.5 + x = 6.800735254 Solving 7.5 + x = 6.800735254 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 = 6.800735254 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = 6.800735254 + -7.5 x = 6.800735254 + -7.5 Combine like terms: 6.800735254 + -7.5 = -0.699264746 x = -0.699264746 Simplifying x = -0.699264746

Subproblem 2

x + 7.5 = -6.800735254 Simplifying x + 7.5 = -6.800735254 Reorder the terms: 7.5 + x = -6.800735254 Solving 7.5 + x = -6.800735254 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 = -6.800735254 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = -6.800735254 + -7.5 x = -6.800735254 + -7.5 Combine like terms: -6.800735254 + -7.5 = -14.300735254 x = -14.300735254 Simplifying x = -14.300735254

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.699264746, -14.300735254}

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