0.1x^2+71x+100=0

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Solution for 0.1x^2+71x+100=0 equation:


Simplifying
0.1x2 + 71x + 100 = 0

Reorder the terms:
100 + 71x + 0.1x2 = 0

Solving
100 + 71x + 0.1x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.1'.
1000 + 710x + x2 = 0

Move the constant term to the right:

Add '-1000' to each side of the equation.
1000 + 710x + -1000 + x2 = 0 + -1000

Reorder the terms:
1000 + -1000 + 710x + x2 = 0 + -1000

Combine like terms: 1000 + -1000 = 0
0 + 710x + x2 = 0 + -1000
710x + x2 = 0 + -1000

Combine like terms: 0 + -1000 = -1000
710x + x2 = -1000

The x term is 710x.  Take half its coefficient (355).
Square it (126025) and add it to both sides.

Add '126025' to each side of the equation.
710x + 126025 + x2 = -1000 + 126025

Reorder the terms:
126025 + 710x + x2 = -1000 + 126025

Combine like terms: -1000 + 126025 = 125025
126025 + 710x + x2 = 125025

Factor a perfect square on the left side:
(x + 355)(x + 355) = 125025

Calculate the square root of the right side: 353.588744165

Break this problem into two subproblems by setting 
(x + 355) equal to 353.588744165 and -353.588744165.

Subproblem 1

x + 355 = 353.588744165 Simplifying x + 355 = 353.588744165 Reorder the terms: 355 + x = 353.588744165 Solving 355 + x = 353.588744165 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-355' to each side of the equation. 355 + -355 + x = 353.588744165 + -355 Combine like terms: 355 + -355 = 0 0 + x = 353.588744165 + -355 x = 353.588744165 + -355 Combine like terms: 353.588744165 + -355 = -1.411255835 x = -1.411255835 Simplifying x = -1.411255835

Subproblem 2

x + 355 = -353.588744165 Simplifying x + 355 = -353.588744165 Reorder the terms: 355 + x = -353.588744165 Solving 355 + x = -353.588744165 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-355' to each side of the equation. 355 + -355 + x = -353.588744165 + -355 Combine like terms: 355 + -355 = 0 0 + x = -353.588744165 + -355 x = -353.588744165 + -355 Combine like terms: -353.588744165 + -355 = -708.588744165 x = -708.588744165 Simplifying x = -708.588744165

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.411255835, -708.588744165}

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