0.2x^2+0.3x-0.15=0

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Solution for 0.2x^2+0.3x-0.15=0 equation: 


Simplifying
0.2x2 + 0.3x + -0.15 = 0

Reorder the terms:
-0.15 + 0.3x + 0.2x2 = 0

Solving
-0.15 + 0.3x + 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'.
-0.75 + 1.5x + x2 = 0

Move the constant term to the right:

Add '0.75' to each side of the equation.
-0.75 + 1.5x + 0.75 + x2 = 0 + 0.75

Reorder the terms:
-0.75 + 0.75 + 1.5x + x2 = 0 + 0.75

Combine like terms: -0.75 + 0.75 = 0.00
0.00 + 1.5x + x2 = 0 + 0.75
1.5x + x2 = 0 + 0.75

Combine like terms: 0 + 0.75 = 0.75
1.5x + x2 = 0.75

The x term is 1.5x.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5x + 0.5625 + x2 = 0.75 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = 0.75 + 0.5625

Combine like terms: 0.75 + 0.5625 = 1.3125
0.5625 + 1.5x + x2 = 1.3125

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 1.3125

Calculate the square root of the right side: 1.145643924

Break this problem into two subproblems by setting 
(x + 0.75) equal to 1.145643924 and -1.145643924.


Subproblem 1
x + 0.75 = 1.145643924

Simplifying
x + 0.75 = 1.145643924

Reorder the terms:
0.75 + x = 1.145643924

Solving
0.75 + x = 1.145643924

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-0.75' to each side of the equation.
0.75 + -0.75 + x = 1.145643924 + -0.75

Combine like terms: 0.75 + -0.75 = 0.00
0.00 + x = 1.145643924 + -0.75
x = 1.145643924 + -0.75

Combine like terms: 1.145643924 + -0.75 = 0.395643924
x = 0.395643924

Simplifying
x = 0.395643924


Subproblem 2
x + 0.75 = -1.145643924

Simplifying
x + 0.75 = -1.145643924

Reorder the terms:
0.75 + x = -1.145643924

Solving
0.75 + x = -1.145643924

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-0.75' to each side of the equation.
0.75 + -0.75 + x = -1.145643924 + -0.75

Combine like terms: 0.75 + -0.75 = 0.00
0.00 + x = -1.145643924 + -0.75
x = -1.145643924 + -0.75

Combine like terms: -1.145643924 + -0.75 = -1.895643924
x = -1.895643924

Simplifying
x = -1.895643924


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {0.395643924, -1.895643924}

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