x^2+x-3900=0

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Solution for x^2+x-3900=0 equation:


Simplifying
x2 + x + -3900 = 0

Reorder the terms:
-3900 + x + x2 = 0

Solving
-3900 + x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '3900' to each side of the equation.
-3900 + x + 3900 + x2 = 0 + 3900

Reorder the terms:
-3900 + 3900 + x + x2 = 0 + 3900

Combine like terms: -3900 + 3900 = 0
0 + x + x2 = 0 + 3900
x + x2 = 0 + 3900

Combine like terms: 0 + 3900 = 3900
x + x2 = 3900

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 = 3900 + 0.25

Reorder the terms:
0.25 + x + x2 = 3900 + 0.25

Combine like terms: 3900 + 0.25 = 3900.25
0.25 + x + x2 = 3900.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 3900.25

Calculate the square root of the right side: 62.451981554

Break this problem into two subproblems by setting 
(x + 0.5) equal to 62.451981554 and -62.451981554.

Subproblem 1

x + 0.5 = 62.451981554 Simplifying x + 0.5 = 62.451981554 Reorder the terms: 0.5 + x = 62.451981554 Solving 0.5 + x = 62.451981554 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 = 62.451981554 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 62.451981554 + -0.5 x = 62.451981554 + -0.5 Combine like terms: 62.451981554 + -0.5 = 61.951981554 x = 61.951981554 Simplifying x = 61.951981554

Subproblem 2

x + 0.5 = -62.451981554 Simplifying x + 0.5 = -62.451981554 Reorder the terms: 0.5 + x = -62.451981554 Solving 0.5 + x = -62.451981554 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 = -62.451981554 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -62.451981554 + -0.5 x = -62.451981554 + -0.5 Combine like terms: -62.451981554 + -0.5 = -62.951981554 x = -62.951981554 Simplifying x = -62.951981554

Solution

The solution to the problem is based on the solutions from the subproblems. x = {61.951981554, -62.951981554}

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