x^2+2x+4x-15=360

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Solution for x^2+2x+4x-15=360 equation:


Simplifying
x2 + 2x + 4x + -15 = 360

Reorder the terms:
-15 + 2x + 4x + x2 = 360

Combine like terms: 2x + 4x = 6x
-15 + 6x + x2 = 360

Solving
-15 + 6x + x2 = 360

Solving for variable 'x'.

Reorder the terms:
-15 + -360 + 6x + x2 = 360 + -360

Combine like terms: -15 + -360 = -375
-375 + 6x + x2 = 360 + -360

Combine like terms: 360 + -360 = 0
-375 + 6x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '375' to each side of the equation.
-375 + 6x + 375 + x2 = 0 + 375

Reorder the terms:
-375 + 375 + 6x + x2 = 0 + 375

Combine like terms: -375 + 375 = 0
0 + 6x + x2 = 0 + 375
6x + x2 = 0 + 375

Combine like terms: 0 + 375 = 375
6x + x2 = 375

The x term is 6x.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x + 9 + x2 = 375 + 9

Reorder the terms:
9 + 6x + x2 = 375 + 9

Combine like terms: 375 + 9 = 384
9 + 6x + x2 = 384

Factor a perfect square on the left side:
(x + 3)(x + 3) = 384

Calculate the square root of the right side: 19.595917942

Break this problem into two subproblems by setting 
(x + 3) equal to 19.595917942 and -19.595917942.

Subproblem 1

x + 3 = 19.595917942 Simplifying x + 3 = 19.595917942 Reorder the terms: 3 + x = 19.595917942 Solving 3 + x = 19.595917942 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 19.595917942 + -3 Combine like terms: 3 + -3 = 0 0 + x = 19.595917942 + -3 x = 19.595917942 + -3 Combine like terms: 19.595917942 + -3 = 16.595917942 x = 16.595917942 Simplifying x = 16.595917942

Subproblem 2

x + 3 = -19.595917942 Simplifying x + 3 = -19.595917942 Reorder the terms: 3 + x = -19.595917942 Solving 3 + x = -19.595917942 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = -19.595917942 + -3 Combine like terms: 3 + -3 = 0 0 + x = -19.595917942 + -3 x = -19.595917942 + -3 Combine like terms: -19.595917942 + -3 = -22.595917942 x = -22.595917942 Simplifying x = -22.595917942

Solution

The solution to the problem is based on the solutions from the subproblems. x = {16.595917942, -22.595917942}

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