2.5x^2+3x+0.5=0

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Solution for 2.5x^2+3x+0.5=0 equation:


Simplifying
2.5x2 + 3x + 0.5 = 0

Reorder the terms:
0.5 + 3x + 2.5x2 = 0

Solving
0.5 + 3x + 2.5x2 = 0

Solving for variable 'x'.

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

Divide each side by '2.5'.
0.2 + 1.2x + x2 = 0

Move the constant term to the right:

Add '-0.2' to each side of the equation.
0.2 + 1.2x + -0.2 + x2 = 0 + -0.2

Reorder the terms:
0.2 + -0.2 + 1.2x + x2 = 0 + -0.2

Combine like terms: 0.2 + -0.2 = 0.0
0.0 + 1.2x + x2 = 0 + -0.2
1.2x + x2 = 0 + -0.2

Combine like terms: 0 + -0.2 = -0.2
1.2x + x2 = -0.2

The x term is 1.2x.  Take half its coefficient (0.6).
Square it (0.36) and add it to both sides.

Add '0.36' to each side of the equation.
1.2x + 0.36 + x2 = -0.2 + 0.36

Reorder the terms:
0.36 + 1.2x + x2 = -0.2 + 0.36

Combine like terms: -0.2 + 0.36 = 0.16
0.36 + 1.2x + x2 = 0.16

Factor a perfect square on the left side:
(x + 0.6)(x + 0.6) = 0.16

Calculate the square root of the right side: 0.4

Break this problem into two subproblems by setting 
(x + 0.6) equal to 0.4 and -0.4.

Subproblem 1

x + 0.6 = 0.4 Simplifying x + 0.6 = 0.4 Reorder the terms: 0.6 + x = 0.4 Solving 0.6 + x = 0.4 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.6' to each side of the equation. 0.6 + -0.6 + x = 0.4 + -0.6 Combine like terms: 0.6 + -0.6 = 0.0 0.0 + x = 0.4 + -0.6 x = 0.4 + -0.6 Combine like terms: 0.4 + -0.6 = -0.2 x = -0.2 Simplifying x = -0.2

Subproblem 2

x + 0.6 = -0.4 Simplifying x + 0.6 = -0.4 Reorder the terms: 0.6 + x = -0.4 Solving 0.6 + x = -0.4 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.6' to each side of the equation. 0.6 + -0.6 + x = -0.4 + -0.6 Combine like terms: 0.6 + -0.6 = 0.0 0.0 + x = -0.4 + -0.6 x = -0.4 + -0.6 Combine like terms: -0.4 + -0.6 = -1 x = -1 Simplifying x = -1

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.2, -1}

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