3.2x^2+0.2x-5=0

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Solution for 3.2x^2+0.2x-5=0 equation:


Simplifying
3.2x2 + 0.2x + -5 = 0

Reorder the terms:
-5 + 0.2x + 3.2x2 = 0

Solving
-5 + 0.2x + 3.2x2 = 0

Solving for variable 'x'.

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

Divide each side by '3.2'.
-1.5625 + 0.0625x + x2 = 0

Move the constant term to the right:

Add '1.5625' to each side of the equation.
-1.5625 + 0.0625x + 1.5625 + x2 = 0 + 1.5625

Reorder the terms:
-1.5625 + 1.5625 + 0.0625x + x2 = 0 + 1.5625

Combine like terms: -1.5625 + 1.5625 = 0.0000
0.0000 + 0.0625x + x2 = 0 + 1.5625
0.0625x + x2 = 0 + 1.5625

Combine like terms: 0 + 1.5625 = 1.5625
0.0625x + x2 = 1.5625

The x term is 0.0625x.  Take half its coefficient (0.03125).
Square it (0.0009765625) and add it to both sides.

Add '0.0009765625' to each side of the equation.
0.0625x + 0.0009765625 + x2 = 1.5625 + 0.0009765625

Reorder the terms:
0.0009765625 + 0.0625x + x2 = 1.5625 + 0.0009765625

Combine like terms: 1.5625 + 0.0009765625 = 1.5634765625
0.0009765625 + 0.0625x + x2 = 1.5634765625

Factor a perfect square on the left side:
(x + 0.03125)(x + 0.03125) = 1.5634765625

Calculate the square root of the right side: 1.250390564

Break this problem into two subproblems by setting 
(x + 0.03125) equal to 1.250390564 and -1.250390564.

Subproblem 1

x + 0.03125 = 1.250390564 Simplifying x + 0.03125 = 1.250390564 Reorder the terms: 0.03125 + x = 1.250390564 Solving 0.03125 + x = 1.250390564 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.03125' to each side of the equation. 0.03125 + -0.03125 + x = 1.250390564 + -0.03125 Combine like terms: 0.03125 + -0.03125 = 0.00000 0.00000 + x = 1.250390564 + -0.03125 x = 1.250390564 + -0.03125 Combine like terms: 1.250390564 + -0.03125 = 1.219140564 x = 1.219140564 Simplifying x = 1.219140564

Subproblem 2

x + 0.03125 = -1.250390564 Simplifying x + 0.03125 = -1.250390564 Reorder the terms: 0.03125 + x = -1.250390564 Solving 0.03125 + x = -1.250390564 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.03125' to each side of the equation. 0.03125 + -0.03125 + x = -1.250390564 + -0.03125 Combine like terms: 0.03125 + -0.03125 = 0.00000 0.00000 + x = -1.250390564 + -0.03125 x = -1.250390564 + -0.03125 Combine like terms: -1.250390564 + -0.03125 = -1.281640564 x = -1.281640564 Simplifying x = -1.281640564

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.219140564, -1.281640564}

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