0=0.6x^2-3x-1.5

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Solution for 0=0.6x^2-3x-1.5 equation:


Simplifying
0 = 0.6x2 + -3x + -1.5

Reorder the terms:
0 = -1.5 + -3x + 0.6x2

Solving
0 = -1.5 + -3x + 0.6x2

Solving for variable 'x'.

Combine like terms: 0 + 1.5 = 1.5
1.5 + 3x + -0.6x2 = -1.5 + -3x + 0.6x2 + 1.5 + 3x + -0.6x2

Reorder the terms:
1.5 + 3x + -0.6x2 = -1.5 + 1.5 + -3x + 3x + 0.6x2 + -0.6x2

Combine like terms: -1.5 + 1.5 = 0.0
1.5 + 3x + -0.6x2 = 0.0 + -3x + 3x + 0.6x2 + -0.6x2
1.5 + 3x + -0.6x2 = -3x + 3x + 0.6x2 + -0.6x2

Combine like terms: -3x + 3x = 0
1.5 + 3x + -0.6x2 = 0 + 0.6x2 + -0.6x2
1.5 + 3x + -0.6x2 = 0.6x2 + -0.6x2

Combine like terms: 0.6x2 + -0.6x2 = 0.0
1.5 + 3x + -0.6x2 = 0.0

Begin completing the square.  Divide all terms by
-0.6 the coefficient of the squared term: 

Divide each side by '-0.6'.
-2.5 + -5x + x2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + -5x + 2.5 + x2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + -5x + x2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + -5x + x2 = 0 + 2.5
-5x + x2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
-5x + x2 = 2.5

The x term is -5x.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x + 6.25 + x2 = 2.5 + 6.25

Reorder the terms:
6.25 + -5x + x2 = 2.5 + 6.25

Combine like terms: 2.5 + 6.25 = 8.75
6.25 + -5x + x2 = 8.75

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 8.75

Calculate the square root of the right side: 2.958039892

Break this problem into two subproblems by setting 
(x + -2.5) equal to 2.958039892 and -2.958039892.

Subproblem 1

x + -2.5 = 2.958039892 Simplifying x + -2.5 = 2.958039892 Reorder the terms: -2.5 + x = 2.958039892 Solving -2.5 + x = 2.958039892 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = 2.958039892 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 2.958039892 + 2.5 x = 2.958039892 + 2.5 Combine like terms: 2.958039892 + 2.5 = 5.458039892 x = 5.458039892 Simplifying x = 5.458039892

Subproblem 2

x + -2.5 = -2.958039892 Simplifying x + -2.5 = -2.958039892 Reorder the terms: -2.5 + x = -2.958039892 Solving -2.5 + x = -2.958039892 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = -2.958039892 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -2.958039892 + 2.5 x = -2.958039892 + 2.5 Combine like terms: -2.958039892 + 2.5 = -0.458039892 x = -0.458039892 Simplifying x = -0.458039892

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.458039892, -0.458039892}

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