x^2+15x+30=6

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Solution for x^2+15x+30=6 equation:


Simplifying
x2 + 15x + 30 = 6

Reorder the terms:
30 + 15x + x2 = 6

Solving
30 + 15x + x2 = 6

Solving for variable 'x'.

Reorder the terms:
30 + -6 + 15x + x2 = 6 + -6

Combine like terms: 30 + -6 = 24
24 + 15x + x2 = 6 + -6

Combine like terms: 6 + -6 = 0
24 + 15x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-24' to each side of the equation.
24 + 15x + -24 + x2 = 0 + -24

Reorder the terms:
24 + -24 + 15x + x2 = 0 + -24

Combine like terms: 24 + -24 = 0
0 + 15x + x2 = 0 + -24
15x + x2 = 0 + -24

Combine like terms: 0 + -24 = -24
15x + x2 = -24

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 = -24 + 56.25

Reorder the terms:
56.25 + 15x + x2 = -24 + 56.25

Combine like terms: -24 + 56.25 = 32.25
56.25 + 15x + x2 = 32.25

Factor a perfect square on the left side:
(x + 7.5)(x + 7.5) = 32.25

Calculate the square root of the right side: 5.678908346

Break this problem into two subproblems by setting 
(x + 7.5) equal to 5.678908346 and -5.678908346.

Subproblem 1

x + 7.5 = 5.678908346 Simplifying x + 7.5 = 5.678908346 Reorder the terms: 7.5 + x = 5.678908346 Solving 7.5 + x = 5.678908346 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 = 5.678908346 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = 5.678908346 + -7.5 x = 5.678908346 + -7.5 Combine like terms: 5.678908346 + -7.5 = -1.821091654 x = -1.821091654 Simplifying x = -1.821091654

Subproblem 2

x + 7.5 = -5.678908346 Simplifying x + 7.5 = -5.678908346 Reorder the terms: 7.5 + x = -5.678908346 Solving 7.5 + x = -5.678908346 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 = -5.678908346 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = -5.678908346 + -7.5 x = -5.678908346 + -7.5 Combine like terms: -5.678908346 + -7.5 = -13.178908346 x = -13.178908346 Simplifying x = -13.178908346

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.821091654, -13.178908346}

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