x^2-.5x-2.1875=0

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Solution for x^2-.5x-2.1875=0 equation:


Simplifying
x2 + -0.5x + -2.1875 = 0

Reorder the terms:
-2.1875 + -0.5x + x2 = 0

Solving
-2.1875 + -0.5x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '2.1875' to each side of the equation.
-2.1875 + -0.5x + 2.1875 + x2 = 0 + 2.1875

Reorder the terms:
-2.1875 + 2.1875 + -0.5x + x2 = 0 + 2.1875

Combine like terms: -2.1875 + 2.1875 = 0.0000
0.0000 + -0.5x + x2 = 0 + 2.1875
-0.5x + x2 = 0 + 2.1875

Combine like terms: 0 + 2.1875 = 2.1875
-0.5x + x2 = 2.1875

The x term is -0.5x.  Take half its coefficient (-0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
-0.5x + 0.0625 + x2 = 2.1875 + 0.0625

Reorder the terms:
0.0625 + -0.5x + x2 = 2.1875 + 0.0625

Combine like terms: 2.1875 + 0.0625 = 2.25
0.0625 + -0.5x + x2 = 2.25

Factor a perfect square on the left side:
(x + -0.25)(x + -0.25) = 2.25

Calculate the square root of the right side: 1.5

Break this problem into two subproblems by setting 
(x + -0.25) equal to 1.5 and -1.5.

Subproblem 1

x + -0.25 = 1.5 Simplifying x + -0.25 = 1.5 Reorder the terms: -0.25 + x = 1.5 Solving -0.25 + x = 1.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = 1.5 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = 1.5 + 0.25 x = 1.5 + 0.25 Combine like terms: 1.5 + 0.25 = 1.75 x = 1.75 Simplifying x = 1.75

Subproblem 2

x + -0.25 = -1.5 Simplifying x + -0.25 = -1.5 Reorder the terms: -0.25 + x = -1.5 Solving -0.25 + x = -1.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = -1.5 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = -1.5 + 0.25 x = -1.5 + 0.25 Combine like terms: -1.5 + 0.25 = -1.25 x = -1.25 Simplifying x = -1.25

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.75, -1.25}

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