x^2+14x=-15

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Solution for x^2+14x=-15 equation:


Simplifying
x2 + 14x = -15

Reorder the terms:
14x + x2 = -15

Solving
14x + x2 = -15

Solving for variable 'x'.

Reorder the terms:
15 + 14x + x2 = -15 + 15

Combine like terms: -15 + 15 = 0
15 + 14x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-15' to each side of the equation.
15 + 14x + -15 + x2 = 0 + -15

Reorder the terms:
15 + -15 + 14x + x2 = 0 + -15

Combine like terms: 15 + -15 = 0
0 + 14x + x2 = 0 + -15
14x + x2 = 0 + -15

Combine like terms: 0 + -15 = -15
14x + x2 = -15

The x term is 14x.  Take half its coefficient (7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
14x + 49 + x2 = -15 + 49

Reorder the terms:
49 + 14x + x2 = -15 + 49

Combine like terms: -15 + 49 = 34
49 + 14x + x2 = 34

Factor a perfect square on the left side:
(x + 7)(x + 7) = 34

Calculate the square root of the right side: 5.830951895

Break this problem into two subproblems by setting 
(x + 7) equal to 5.830951895 and -5.830951895.

Subproblem 1

x + 7 = 5.830951895 Simplifying x + 7 = 5.830951895 Reorder the terms: 7 + x = 5.830951895 Solving 7 + x = 5.830951895 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + x = 5.830951895 + -7 Combine like terms: 7 + -7 = 0 0 + x = 5.830951895 + -7 x = 5.830951895 + -7 Combine like terms: 5.830951895 + -7 = -1.169048105 x = -1.169048105 Simplifying x = -1.169048105

Subproblem 2

x + 7 = -5.830951895 Simplifying x + 7 = -5.830951895 Reorder the terms: 7 + x = -5.830951895 Solving 7 + x = -5.830951895 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + x = -5.830951895 + -7 Combine like terms: 7 + -7 = 0 0 + x = -5.830951895 + -7 x = -5.830951895 + -7 Combine like terms: -5.830951895 + -7 = -12.830951895 x = -12.830951895 Simplifying x = -12.830951895

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.169048105, -12.830951895}

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