5x+x^2=800

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Solution for 5x+x^2=800 equation:


Simplifying
5x + x2 = 800

Solving
5x + x2 = 800

Solving for variable 'x'.

Reorder the terms:
-800 + 5x + x2 = 800 + -800

Combine like terms: 800 + -800 = 0
-800 + 5x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '800' to each side of the equation.
-800 + 5x + 800 + x2 = 0 + 800

Reorder the terms:
-800 + 800 + 5x + x2 = 0 + 800

Combine like terms: -800 + 800 = 0
0 + 5x + x2 = 0 + 800
5x + x2 = 0 + 800

Combine like terms: 0 + 800 = 800
5x + x2 = 800

The x term is 5x.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5x + 6.25 + x2 = 800 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 800 + 6.25

Combine like terms: 800 + 6.25 = 806.25
6.25 + 5x + x2 = 806.25

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 806.25

Calculate the square root of the right side: 28.394541729

Break this problem into two subproblems by setting 
(x + 2.5) equal to 28.394541729 and -28.394541729.

Subproblem 1

x + 2.5 = 28.394541729 Simplifying x + 2.5 = 28.394541729 Reorder the terms: 2.5 + x = 28.394541729 Solving 2.5 + x = 28.394541729 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = 28.394541729 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 28.394541729 + -2.5 x = 28.394541729 + -2.5 Combine like terms: 28.394541729 + -2.5 = 25.894541729 x = 25.894541729 Simplifying x = 25.894541729

Subproblem 2

x + 2.5 = -28.394541729 Simplifying x + 2.5 = -28.394541729 Reorder the terms: 2.5 + x = -28.394541729 Solving 2.5 + x = -28.394541729 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = -28.394541729 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -28.394541729 + -2.5 x = -28.394541729 + -2.5 Combine like terms: -28.394541729 + -2.5 = -30.894541729 x = -30.894541729 Simplifying x = -30.894541729

Solution

The solution to the problem is based on the solutions from the subproblems. x = {25.894541729, -30.894541729}

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