0.5x^2-x-1.5=0

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


Simplifying
0.5x2 + -1x + -1.5 = 0

Reorder the terms:
-1.5 + -1x + 0.5x2 = 0

Solving
-1.5 + -1x + 0.5x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.5'.
-3 + -2x + x2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + -2x + 3 + x2 = 0 + 3

Reorder the terms:
-3 + 3 + -2x + x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -2x + x2 = 0 + 3
-2x + x2 = 0 + 3

Combine like terms: 0 + 3 = 3
-2x + x2 = 3

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = 3 + 1

Reorder the terms:
1 + -2x + x2 = 3 + 1

Combine like terms: 3 + 1 = 4
1 + -2x + x2 = 4

Factor a perfect square on the left side:
(x + -1)(x + -1) = 4

Calculate the square root of the right side: 2

Break this problem into two subproblems by setting 
(x + -1) equal to 2 and -2.

Subproblem 1

x + -1 = 2 Simplifying x + -1 = 2 Reorder the terms: -1 + x = 2 Solving -1 + x = 2 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 2 + 1 Combine like terms: -1 + 1 = 0 0 + x = 2 + 1 x = 2 + 1 Combine like terms: 2 + 1 = 3 x = 3 Simplifying x = 3

Subproblem 2

x + -1 = -2 Simplifying x + -1 = -2 Reorder the terms: -1 + x = -2 Solving -1 + x = -2 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -2 + 1 Combine like terms: -1 + 1 = 0 0 + x = -2 + 1 x = -2 + 1 Combine like terms: -2 + 1 = -1 x = -1 Simplifying x = -1

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3, -1}

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