5x^2+2x=125

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Solution for 5x^2+2x=125 equation:


Simplifying
5x2 + 2x = 125

Reorder the terms:
2x + 5x2 = 125

Solving
2x + 5x2 = 125

Solving for variable 'x'.

Reorder the terms:
-125 + 2x + 5x2 = 125 + -125

Combine like terms: 125 + -125 = 0
-125 + 2x + 5x2 = 0

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

Divide each side by '5'.
-25 + 0.4x + x2 = 0

Move the constant term to the right:

Add '25' to each side of the equation.
-25 + 0.4x + 25 + x2 = 0 + 25

Reorder the terms:
-25 + 25 + 0.4x + x2 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + 0.4x + x2 = 0 + 25
0.4x + x2 = 0 + 25

Combine like terms: 0 + 25 = 25
0.4x + x2 = 25

The x term is 0.4x.  Take half its coefficient (0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
0.4x + 0.04 + x2 = 25 + 0.04

Reorder the terms:
0.04 + 0.4x + x2 = 25 + 0.04

Combine like terms: 25 + 0.04 = 25.04
0.04 + 0.4x + x2 = 25.04

Factor a perfect square on the left side:
(x + 0.2)(x + 0.2) = 25.04

Calculate the square root of the right side: 5.003998401

Break this problem into two subproblems by setting 
(x + 0.2) equal to 5.003998401 and -5.003998401.

Subproblem 1

x + 0.2 = 5.003998401 Simplifying x + 0.2 = 5.003998401 Reorder the terms: 0.2 + x = 5.003998401 Solving 0.2 + x = 5.003998401 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2' to each side of the equation. 0.2 + -0.2 + x = 5.003998401 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + x = 5.003998401 + -0.2 x = 5.003998401 + -0.2 Combine like terms: 5.003998401 + -0.2 = 4.803998401 x = 4.803998401 Simplifying x = 4.803998401

Subproblem 2

x + 0.2 = -5.003998401 Simplifying x + 0.2 = -5.003998401 Reorder the terms: 0.2 + x = -5.003998401 Solving 0.2 + x = -5.003998401 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2' to each side of the equation. 0.2 + -0.2 + x = -5.003998401 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + x = -5.003998401 + -0.2 x = -5.003998401 + -0.2 Combine like terms: -5.003998401 + -0.2 = -5.203998401 x = -5.203998401 Simplifying x = -5.203998401

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.803998401, -5.203998401}

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