6400-3x-x^2=0

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Solution for 6400-3x-x^2=0 equation:


Simplifying
6400 + -3x + -1x2 = 0

Solving
6400 + -3x + -1x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-6400 + 3x + x2 = 0

Move the constant term to the right:

Add '6400' to each side of the equation.
-6400 + 3x + 6400 + x2 = 0 + 6400

Reorder the terms:
-6400 + 6400 + 3x + x2 = 0 + 6400

Combine like terms: -6400 + 6400 = 0
0 + 3x + x2 = 0 + 6400
3x + x2 = 0 + 6400

Combine like terms: 0 + 6400 = 6400
3x + x2 = 6400

The x term is 3x.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x + 2.25 + x2 = 6400 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 6400 + 2.25

Combine like terms: 6400 + 2.25 = 6402.25
2.25 + 3x + x2 = 6402.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 6402.25

Calculate the square root of the right side: 80.014061264

Break this problem into two subproblems by setting 
(x + 1.5) equal to 80.014061264 and -80.014061264.

Subproblem 1

x + 1.5 = 80.014061264 Simplifying x + 1.5 = 80.014061264 Reorder the terms: 1.5 + x = 80.014061264 Solving 1.5 + x = 80.014061264 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = 80.014061264 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 80.014061264 + -1.5 x = 80.014061264 + -1.5 Combine like terms: 80.014061264 + -1.5 = 78.514061264 x = 78.514061264 Simplifying x = 78.514061264

Subproblem 2

x + 1.5 = -80.014061264 Simplifying x + 1.5 = -80.014061264 Reorder the terms: 1.5 + x = -80.014061264 Solving 1.5 + x = -80.014061264 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = -80.014061264 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -80.014061264 + -1.5 x = -80.014061264 + -1.5 Combine like terms: -80.014061264 + -1.5 = -81.514061264 x = -81.514061264 Simplifying x = -81.514061264

Solution

The solution to the problem is based on the solutions from the subproblems. x = {78.514061264, -81.514061264}

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