420-4800x-x^2=0

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Solution for 420-4800x-x^2=0 equation:


Simplifying
420 + -4800x + -1x2 = 0

Solving
420 + -4800x + -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'.
-420 + 4800x + x2 = 0

Move the constant term to the right:

Add '420' to each side of the equation.
-420 + 4800x + 420 + x2 = 0 + 420

Reorder the terms:
-420 + 420 + 4800x + x2 = 0 + 420

Combine like terms: -420 + 420 = 0
0 + 4800x + x2 = 0 + 420
4800x + x2 = 0 + 420

Combine like terms: 0 + 420 = 420
4800x + x2 = 420

The x term is 4800x.  Take half its coefficient (2400).
Square it (5760000) and add it to both sides.

Add '5760000' to each side of the equation.
4800x + 5760000 + x2 = 420 + 5760000

Reorder the terms:
5760000 + 4800x + x2 = 420 + 5760000

Combine like terms: 420 + 5760000 = 5760420
5760000 + 4800x + x2 = 5760420

Factor a perfect square on the left side:
(x + 2400)(x + 2400) = 5760420

Calculate the square root of the right side: 2400.087498405

Break this problem into two subproblems by setting 
(x + 2400) equal to 2400.087498405 and -2400.087498405.

Subproblem 1

x + 2400 = 2400.087498405 Simplifying x + 2400 = 2400.087498405 Reorder the terms: 2400 + x = 2400.087498405 Solving 2400 + x = 2400.087498405 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2400' to each side of the equation. 2400 + -2400 + x = 2400.087498405 + -2400 Combine like terms: 2400 + -2400 = 0 0 + x = 2400.087498405 + -2400 x = 2400.087498405 + -2400 Combine like terms: 2400.087498405 + -2400 = 0.087498405 x = 0.087498405 Simplifying x = 0.087498405

Subproblem 2

x + 2400 = -2400.087498405 Simplifying x + 2400 = -2400.087498405 Reorder the terms: 2400 + x = -2400.087498405 Solving 2400 + x = -2400.087498405 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2400' to each side of the equation. 2400 + -2400 + x = -2400.087498405 + -2400 Combine like terms: 2400 + -2400 = 0 0 + x = -2400.087498405 + -2400 x = -2400.087498405 + -2400 Combine like terms: -2400.087498405 + -2400 = -4800.087498405 x = -4800.087498405 Simplifying x = -4800.087498405

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.087498405, -4800.087498405}

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