x^2+10x+4x+21=360

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Solution for x^2+10x+4x+21=360 equation:


Simplifying
x2 + 10x + 4x + 21 = 360

Reorder the terms:
21 + 10x + 4x + x2 = 360

Combine like terms: 10x + 4x = 14x
21 + 14x + x2 = 360

Solving
21 + 14x + x2 = 360

Solving for variable 'x'.

Reorder the terms:
21 + -360 + 14x + x2 = 360 + -360

Combine like terms: 21 + -360 = -339
-339 + 14x + x2 = 360 + -360

Combine like terms: 360 + -360 = 0
-339 + 14x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '339' to each side of the equation.
-339 + 14x + 339 + x2 = 0 + 339

Reorder the terms:
-339 + 339 + 14x + x2 = 0 + 339

Combine like terms: -339 + 339 = 0
0 + 14x + x2 = 0 + 339
14x + x2 = 0 + 339

Combine like terms: 0 + 339 = 339
14x + x2 = 339

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 = 339 + 49

Reorder the terms:
49 + 14x + x2 = 339 + 49

Combine like terms: 339 + 49 = 388
49 + 14x + x2 = 388

Factor a perfect square on the left side:
(x + 7)(x + 7) = 388

Calculate the square root of the right side: 19.697715604

Break this problem into two subproblems by setting 
(x + 7) equal to 19.697715604 and -19.697715604.

Subproblem 1

x + 7 = 19.697715604 Simplifying x + 7 = 19.697715604 Reorder the terms: 7 + x = 19.697715604 Solving 7 + x = 19.697715604 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 = 19.697715604 + -7 Combine like terms: 7 + -7 = 0 0 + x = 19.697715604 + -7 x = 19.697715604 + -7 Combine like terms: 19.697715604 + -7 = 12.697715604 x = 12.697715604 Simplifying x = 12.697715604

Subproblem 2

x + 7 = -19.697715604 Simplifying x + 7 = -19.697715604 Reorder the terms: 7 + x = -19.697715604 Solving 7 + x = -19.697715604 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 = -19.697715604 + -7 Combine like terms: 7 + -7 = 0 0 + x = -19.697715604 + -7 x = -19.697715604 + -7 Combine like terms: -19.697715604 + -7 = -26.697715604 x = -26.697715604 Simplifying x = -26.697715604

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.697715604, -26.697715604}

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