0=-0.5x^2+1.5x+3.99

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Solution for 0=-0.5x^2+1.5x+3.99 equation:


Simplifying
0 = -0.5x2 + 1.5x + 3.99

Reorder the terms:
0 = 3.99 + 1.5x + -0.5x2

Solving
0 = 3.99 + 1.5x + -0.5x2

Solving for variable 'x'.

Combine like terms: 0 + -3.99 = -3.99
-3.99 + -1.5x + 0.5x2 = 3.99 + 1.5x + -0.5x2 + -3.99 + -1.5x + 0.5x2

Reorder the terms:
-3.99 + -1.5x + 0.5x2 = 3.99 + -3.99 + 1.5x + -1.5x + -0.5x2 + 0.5x2

Combine like terms: 3.99 + -3.99 = 0.00
-3.99 + -1.5x + 0.5x2 = 0.00 + 1.5x + -1.5x + -0.5x2 + 0.5x2
-3.99 + -1.5x + 0.5x2 = 1.5x + -1.5x + -0.5x2 + 0.5x2

Combine like terms: 1.5x + -1.5x = 0.0
-3.99 + -1.5x + 0.5x2 = 0.0 + -0.5x2 + 0.5x2
-3.99 + -1.5x + 0.5x2 = -0.5x2 + 0.5x2

Combine like terms: -0.5x2 + 0.5x2 = 0.0
-3.99 + -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'.
-7.98 + -3x + x2 = 0

Move the constant term to the right:

Add '7.98' to each side of the equation.
-7.98 + -3x + 7.98 + x2 = 0 + 7.98

Reorder the terms:
-7.98 + 7.98 + -3x + x2 = 0 + 7.98

Combine like terms: -7.98 + 7.98 = 0.00
0.00 + -3x + x2 = 0 + 7.98
-3x + x2 = 0 + 7.98

Combine like terms: 0 + 7.98 = 7.98
-3x + x2 = 7.98

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 = 7.98 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 7.98 + 2.25

Combine like terms: 7.98 + 2.25 = 10.23
2.25 + -3x + x2 = 10.23

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 10.23

Calculate the square root of the right side: 3.198437118

Break this problem into two subproblems by setting 
(x + -1.5) equal to 3.198437118 and -3.198437118.

Subproblem 1

x + -1.5 = 3.198437118 Simplifying x + -1.5 = 3.198437118 Reorder the terms: -1.5 + x = 3.198437118 Solving -1.5 + x = 3.198437118 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 = 3.198437118 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 3.198437118 + 1.5 x = 3.198437118 + 1.5 Combine like terms: 3.198437118 + 1.5 = 4.698437118 x = 4.698437118 Simplifying x = 4.698437118

Subproblem 2

x + -1.5 = -3.198437118 Simplifying x + -1.5 = -3.198437118 Reorder the terms: -1.5 + x = -3.198437118 Solving -1.5 + x = -3.198437118 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 = -3.198437118 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -3.198437118 + 1.5 x = -3.198437118 + 1.5 Combine like terms: -3.198437118 + 1.5 = -1.698437118 x = -1.698437118 Simplifying x = -1.698437118

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.698437118, -1.698437118}

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