x*x+2x-216=0

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Solution for x*x+2x-216=0 equation:


Simplifying
x * x + 2x + -216 = 0

Multiply x * x
x2 + 2x + -216 = 0

Reorder the terms:
-216 + 2x + x2 = 0

Solving
-216 + 2x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '216' to each side of the equation.
-216 + 2x + 216 + x2 = 0 + 216

Reorder the terms:
-216 + 216 + 2x + x2 = 0 + 216

Combine like terms: -216 + 216 = 0
0 + 2x + x2 = 0 + 216
2x + x2 = 0 + 216

Combine like terms: 0 + 216 = 216
2x + x2 = 216

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 216 + 1

Reorder the terms:
1 + 2x + x2 = 216 + 1

Combine like terms: 216 + 1 = 217
1 + 2x + x2 = 217

Factor a perfect square on the left side:
(x + 1)(x + 1) = 217

Calculate the square root of the right side: 14.730919863

Break this problem into two subproblems by setting 
(x + 1) equal to 14.730919863 and -14.730919863.

Subproblem 1

x + 1 = 14.730919863 Simplifying x + 1 = 14.730919863 Reorder the terms: 1 + x = 14.730919863 Solving 1 + x = 14.730919863 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 14.730919863 + -1 Combine like terms: 1 + -1 = 0 0 + x = 14.730919863 + -1 x = 14.730919863 + -1 Combine like terms: 14.730919863 + -1 = 13.730919863 x = 13.730919863 Simplifying x = 13.730919863

Subproblem 2

x + 1 = -14.730919863 Simplifying x + 1 = -14.730919863 Reorder the terms: 1 + x = -14.730919863 Solving 1 + x = -14.730919863 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -14.730919863 + -1 Combine like terms: 1 + -1 = 0 0 + x = -14.730919863 + -1 x = -14.730919863 + -1 Combine like terms: -14.730919863 + -1 = -15.730919863 x = -15.730919863 Simplifying x = -15.730919863

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.730919863, -15.730919863}

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