0.04x^2+8.3x+4.3=0

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Solution for 0.04x^2+8.3x+4.3=0 equation:


Simplifying
0.04x2 + 8.3x + 4.3 = 0

Reorder the terms:
4.3 + 8.3x + 0.04x2 = 0

Solving
4.3 + 8.3x + 0.04x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.04'.
107.5 + 207.5x + x2 = 0

Move the constant term to the right:

Add '-107.5' to each side of the equation.
107.5 + 207.5x + -107.5 + x2 = 0 + -107.5

Reorder the terms:
107.5 + -107.5 + 207.5x + x2 = 0 + -107.5

Combine like terms: 107.5 + -107.5 = 0.0
0.0 + 207.5x + x2 = 0 + -107.5
207.5x + x2 = 0 + -107.5

Combine like terms: 0 + -107.5 = -107.5
207.5x + x2 = -107.5

The x term is 207.5x.  Take half its coefficient (103.75).
Square it (10764.0625) and add it to both sides.

Add '10764.0625' to each side of the equation.
207.5x + 10764.0625 + x2 = -107.5 + 10764.0625

Reorder the terms:
10764.0625 + 207.5x + x2 = -107.5 + 10764.0625

Combine like terms: -107.5 + 10764.0625 = 10656.5625
10764.0625 + 207.5x + x2 = 10656.5625

Factor a perfect square on the left side:
(x + 103.75)(x + 103.75) = 10656.5625

Calculate the square root of the right side: 103.230627723

Break this problem into two subproblems by setting 
(x + 103.75) equal to 103.230627723 and -103.230627723.

Subproblem 1

x + 103.75 = 103.230627723 Simplifying x + 103.75 = 103.230627723 Reorder the terms: 103.75 + x = 103.230627723 Solving 103.75 + x = 103.230627723 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-103.75' to each side of the equation. 103.75 + -103.75 + x = 103.230627723 + -103.75 Combine like terms: 103.75 + -103.75 = 0.00 0.00 + x = 103.230627723 + -103.75 x = 103.230627723 + -103.75 Combine like terms: 103.230627723 + -103.75 = -0.519372277 x = -0.519372277 Simplifying x = -0.519372277

Subproblem 2

x + 103.75 = -103.230627723 Simplifying x + 103.75 = -103.230627723 Reorder the terms: 103.75 + x = -103.230627723 Solving 103.75 + x = -103.230627723 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-103.75' to each side of the equation. 103.75 + -103.75 + x = -103.230627723 + -103.75 Combine like terms: 103.75 + -103.75 = 0.00 0.00 + x = -103.230627723 + -103.75 x = -103.230627723 + -103.75 Combine like terms: -103.230627723 + -103.75 = -206.980627723 x = -206.980627723 Simplifying x = -206.980627723

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.519372277, -206.980627723}

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