5x+x^2=171

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Solution for 5x+x^2=171 equation:


Simplifying
5x + x2 = 171

Solving
5x + x2 = 171

Solving for variable 'x'.

Reorder the terms:
-171 + 5x + x2 = 171 + -171

Combine like terms: 171 + -171 = 0
-171 + 5x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '171' to each side of the equation.
-171 + 5x + 171 + x2 = 0 + 171

Reorder the terms:
-171 + 171 + 5x + x2 = 0 + 171

Combine like terms: -171 + 171 = 0
0 + 5x + x2 = 0 + 171
5x + x2 = 0 + 171

Combine like terms: 0 + 171 = 171
5x + x2 = 171

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 = 171 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 171 + 6.25

Combine like terms: 171 + 6.25 = 177.25
6.25 + 5x + x2 = 177.25

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 177.25

Calculate the square root of the right side: 13.313526956

Break this problem into two subproblems by setting 
(x + 2.5) equal to 13.313526956 and -13.313526956.

Subproblem 1

x + 2.5 = 13.313526956 Simplifying x + 2.5 = 13.313526956 Reorder the terms: 2.5 + x = 13.313526956 Solving 2.5 + x = 13.313526956 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 = 13.313526956 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 13.313526956 + -2.5 x = 13.313526956 + -2.5 Combine like terms: 13.313526956 + -2.5 = 10.813526956 x = 10.813526956 Simplifying x = 10.813526956

Subproblem 2

x + 2.5 = -13.313526956 Simplifying x + 2.5 = -13.313526956 Reorder the terms: 2.5 + x = -13.313526956 Solving 2.5 + x = -13.313526956 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 = -13.313526956 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -13.313526956 + -2.5 x = -13.313526956 + -2.5 Combine like terms: -13.313526956 + -2.5 = -15.813526956 x = -15.813526956 Simplifying x = -15.813526956

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.813526956, -15.813526956}

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