x^2+x-220=0

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Solution for x^2+x-220=0 equation:


Simplifying
x2 + x + -220 = 0

Reorder the terms:
-220 + x + x2 = 0

Solving
-220 + x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '220' to each side of the equation.
-220 + x + 220 + x2 = 0 + 220

Reorder the terms:
-220 + 220 + x + x2 = 0 + 220

Combine like terms: -220 + 220 = 0
0 + x + x2 = 0 + 220
x + x2 = 0 + 220

Combine like terms: 0 + 220 = 220
x + x2 = 220

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
x + 0.25 + x2 = 220 + 0.25

Reorder the terms:
0.25 + x + x2 = 220 + 0.25

Combine like terms: 220 + 0.25 = 220.25
0.25 + x + x2 = 220.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 220.25

Calculate the square root of the right side: 14.84082208

Break this problem into two subproblems by setting 
(x + 0.5) equal to 14.84082208 and -14.84082208.

Subproblem 1

x + 0.5 = 14.84082208 Simplifying x + 0.5 = 14.84082208 Reorder the terms: 0.5 + x = 14.84082208 Solving 0.5 + x = 14.84082208 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 14.84082208 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 14.84082208 + -0.5 x = 14.84082208 + -0.5 Combine like terms: 14.84082208 + -0.5 = 14.34082208 x = 14.34082208 Simplifying x = 14.34082208

Subproblem 2

x + 0.5 = -14.84082208 Simplifying x + 0.5 = -14.84082208 Reorder the terms: 0.5 + x = -14.84082208 Solving 0.5 + x = -14.84082208 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -14.84082208 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -14.84082208 + -0.5 x = -14.84082208 + -0.5 Combine like terms: -14.84082208 + -0.5 = -15.34082208 x = -15.34082208 Simplifying x = -15.34082208

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.34082208, -15.34082208}

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