4x+800=x^2+10x

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Solution for 4x+800=x^2+10x equation:


Simplifying
4x + 800 = x2 + 10x

Reorder the terms:
800 + 4x = x2 + 10x

Reorder the terms:
800 + 4x = 10x + x2

Solving
800 + 4x = 10x + x2

Solving for variable 'x'.

Combine like terms: 4x + -10x = -6x
800 + -6x + -1x2 = 10x + x2 + -10x + -1x2

Reorder the terms:
800 + -6x + -1x2 = 10x + -10x + x2 + -1x2

Combine like terms: 10x + -10x = 0
800 + -6x + -1x2 = 0 + x2 + -1x2
800 + -6x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
800 + -6x + -1x2 = 0

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

Divide each side by '-1'.
-800 + 6x + x2 = 0

Move the constant term to the right:

Add '800' to each side of the equation.
-800 + 6x + 800 + x2 = 0 + 800

Reorder the terms:
-800 + 800 + 6x + x2 = 0 + 800

Combine like terms: -800 + 800 = 0
0 + 6x + x2 = 0 + 800
6x + x2 = 0 + 800

Combine like terms: 0 + 800 = 800
6x + x2 = 800

The x term is 6x.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x + 9 + x2 = 800 + 9

Reorder the terms:
9 + 6x + x2 = 800 + 9

Combine like terms: 800 + 9 = 809
9 + 6x + x2 = 809

Factor a perfect square on the left side:
(x + 3)(x + 3) = 809

Calculate the square root of the right side: 28.442925307

Break this problem into two subproblems by setting 
(x + 3) equal to 28.442925307 and -28.442925307.

Subproblem 1

x + 3 = 28.442925307 Simplifying x + 3 = 28.442925307 Reorder the terms: 3 + x = 28.442925307 Solving 3 + x = 28.442925307 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 28.442925307 + -3 Combine like terms: 3 + -3 = 0 0 + x = 28.442925307 + -3 x = 28.442925307 + -3 Combine like terms: 28.442925307 + -3 = 25.442925307 x = 25.442925307 Simplifying x = 25.442925307

Subproblem 2

x + 3 = -28.442925307 Simplifying x + 3 = -28.442925307 Reorder the terms: 3 + x = -28.442925307 Solving 3 + x = -28.442925307 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = -28.442925307 + -3 Combine like terms: 3 + -3 = 0 0 + x = -28.442925307 + -3 x = -28.442925307 + -3 Combine like terms: -28.442925307 + -3 = -31.442925307 x = -31.442925307 Simplifying x = -31.442925307

Solution

The solution to the problem is based on the solutions from the subproblems. x = {25.442925307, -31.442925307}

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