0.2x^2+4.1x-30=0

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Solution for 0.2x^2+4.1x-30=0 equation:


Simplifying
0.2x2 + 4.1x + -30 = 0

Reorder the terms:
-30 + 4.1x + 0.2x2 = 0

Solving
-30 + 4.1x + 0.2x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.2'.
-150 + 20.5x + x2 = 0

Move the constant term to the right:

Add '150' to each side of the equation.
-150 + 20.5x + 150 + x2 = 0 + 150

Reorder the terms:
-150 + 150 + 20.5x + x2 = 0 + 150

Combine like terms: -150 + 150 = 0
0 + 20.5x + x2 = 0 + 150
20.5x + x2 = 0 + 150

Combine like terms: 0 + 150 = 150
20.5x + x2 = 150

The x term is 20.5x.  Take half its coefficient (10.25).
Square it (105.0625) and add it to both sides.

Add '105.0625' to each side of the equation.
20.5x + 105.0625 + x2 = 150 + 105.0625

Reorder the terms:
105.0625 + 20.5x + x2 = 150 + 105.0625

Combine like terms: 150 + 105.0625 = 255.0625
105.0625 + 20.5x + x2 = 255.0625

Factor a perfect square on the left side:
(x + 10.25)(x + 10.25) = 255.0625

Calculate the square root of the right side: 15.970676254

Break this problem into two subproblems by setting 
(x + 10.25) equal to 15.970676254 and -15.970676254.

Subproblem 1

x + 10.25 = 15.970676254 Simplifying x + 10.25 = 15.970676254 Reorder the terms: 10.25 + x = 15.970676254 Solving 10.25 + x = 15.970676254 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10.25' to each side of the equation. 10.25 + -10.25 + x = 15.970676254 + -10.25 Combine like terms: 10.25 + -10.25 = 0.00 0.00 + x = 15.970676254 + -10.25 x = 15.970676254 + -10.25 Combine like terms: 15.970676254 + -10.25 = 5.720676254 x = 5.720676254 Simplifying x = 5.720676254

Subproblem 2

x + 10.25 = -15.970676254 Simplifying x + 10.25 = -15.970676254 Reorder the terms: 10.25 + x = -15.970676254 Solving 10.25 + x = -15.970676254 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10.25' to each side of the equation. 10.25 + -10.25 + x = -15.970676254 + -10.25 Combine like terms: 10.25 + -10.25 = 0.00 0.00 + x = -15.970676254 + -10.25 x = -15.970676254 + -10.25 Combine like terms: -15.970676254 + -10.25 = -26.220676254 x = -26.220676254 Simplifying x = -26.220676254

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.720676254, -26.220676254}

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