0=-.5x^2+1.5x+5.72

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Solution for 0=-.5x^2+1.5x+5.72 equation:


Simplifying
0 = -0.5x2 + 1.5x + 5.72

Reorder the terms:
0 = 5.72 + 1.5x + -0.5x2

Solving
0 = 5.72 + 1.5x + -0.5x2

Solving for variable 'x'.

Combine like terms: 0 + -5.72 = -5.72
-5.72 + -1.5x + 0.5x2 = 5.72 + 1.5x + -0.5x2 + -5.72 + -1.5x + 0.5x2

Reorder the terms:
-5.72 + -1.5x + 0.5x2 = 5.72 + -5.72 + 1.5x + -1.5x + -0.5x2 + 0.5x2

Combine like terms: 5.72 + -5.72 = 0.00
-5.72 + -1.5x + 0.5x2 = 0.00 + 1.5x + -1.5x + -0.5x2 + 0.5x2
-5.72 + -1.5x + 0.5x2 = 1.5x + -1.5x + -0.5x2 + 0.5x2

Combine like terms: 1.5x + -1.5x = 0.0
-5.72 + -1.5x + 0.5x2 = 0.0 + -0.5x2 + 0.5x2
-5.72 + -1.5x + 0.5x2 = -0.5x2 + 0.5x2

Combine like terms: -0.5x2 + 0.5x2 = 0.0
-5.72 + -1.5x + 0.5x2 = 0.0

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

Divide each side by '0.5'.
-11.44 + -3x + x2 = 0

Move the constant term to the right:

Add '11.44' to each side of the equation.
-11.44 + -3x + 11.44 + x2 = 0 + 11.44

Reorder the terms:
-11.44 + 11.44 + -3x + x2 = 0 + 11.44

Combine like terms: -11.44 + 11.44 = 0.00
0.00 + -3x + x2 = 0 + 11.44
-3x + x2 = 0 + 11.44

Combine like terms: 0 + 11.44 = 11.44
-3x + x2 = 11.44

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 11.44 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 11.44 + 2.25

Combine like terms: 11.44 + 2.25 = 13.69
2.25 + -3x + x2 = 13.69

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 13.69

Calculate the square root of the right side: 3.7

Break this problem into two subproblems by setting 
(x + -1.5) equal to 3.7 and -3.7.

Subproblem 1

x + -1.5 = 3.7 Simplifying x + -1.5 = 3.7 Reorder the terms: -1.5 + x = 3.7 Solving -1.5 + x = 3.7 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 3.7 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 3.7 + 1.5 x = 3.7 + 1.5 Combine like terms: 3.7 + 1.5 = 5.2 x = 5.2 Simplifying x = 5.2

Subproblem 2

x + -1.5 = -3.7 Simplifying x + -1.5 = -3.7 Reorder the terms: -1.5 + x = -3.7 Solving -1.5 + x = -3.7 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -3.7 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -3.7 + 1.5 x = -3.7 + 1.5 Combine like terms: -3.7 + 1.5 = -2.2 x = -2.2 Simplifying x = -2.2

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.2, -2.2}

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