3.61+x(0.035+x)=5

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Solution for 3.61+x(0.035+x)=5 equation:


Simplifying
3.61 + x(0.035 + x) = 5
3.61 + (0.035 * x + x * x) = 5
3.61 + (0.035x + x2) = 5

Solving
3.61 + 0.035x + x2 = 5

Solving for variable 'x'.

Reorder the terms:
3.61 + -5 + 0.035x + x2 = 5 + -5

Combine like terms: 3.61 + -5 = -1.39
-1.39 + 0.035x + x2 = 5 + -5

Combine like terms: 5 + -5 = 0
-1.39 + 0.035x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '1.39' to each side of the equation.
-1.39 + 0.035x + 1.39 + x2 = 0 + 1.39

Reorder the terms:
-1.39 + 1.39 + 0.035x + x2 = 0 + 1.39

Combine like terms: -1.39 + 1.39 = 0.00
0.00 + 0.035x + x2 = 0 + 1.39
0.035x + x2 = 0 + 1.39

Combine like terms: 0 + 1.39 = 1.39
0.035x + x2 = 1.39

The x term is 0.035x.  Take half its coefficient (0.0175).
Square it (0.00030625) and add it to both sides.

Add '0.00030625' to each side of the equation.
0.035x + 0.00030625 + x2 = 1.39 + 0.00030625

Reorder the terms:
0.00030625 + 0.035x + x2 = 1.39 + 0.00030625

Combine like terms: 1.39 + 0.00030625 = 1.39030625
0.00030625 + 0.035x + x2 = 1.39030625

Factor a perfect square on the left side:
(x + 0.0175)(x + 0.0175) = 1.39030625

Calculate the square root of the right side: 1.179112484

Break this problem into two subproblems by setting 
(x + 0.0175) equal to 1.179112484 and -1.179112484.

Subproblem 1

x + 0.0175 = 1.179112484 Simplifying x + 0.0175 = 1.179112484 Reorder the terms: 0.0175 + x = 1.179112484 Solving 0.0175 + x = 1.179112484 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.0175' to each side of the equation. 0.0175 + -0.0175 + x = 1.179112484 + -0.0175 Combine like terms: 0.0175 + -0.0175 = 0.0000 0.0000 + x = 1.179112484 + -0.0175 x = 1.179112484 + -0.0175 Combine like terms: 1.179112484 + -0.0175 = 1.161612484 x = 1.161612484 Simplifying x = 1.161612484

Subproblem 2

x + 0.0175 = -1.179112484 Simplifying x + 0.0175 = -1.179112484 Reorder the terms: 0.0175 + x = -1.179112484 Solving 0.0175 + x = -1.179112484 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.0175' to each side of the equation. 0.0175 + -0.0175 + x = -1.179112484 + -0.0175 Combine like terms: 0.0175 + -0.0175 = 0.0000 0.0000 + x = -1.179112484 + -0.0175 x = -1.179112484 + -0.0175 Combine like terms: -1.179112484 + -0.0175 = -1.196612484 x = -1.196612484 Simplifying x = -1.196612484

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.161612484, -1.196612484}

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