x^2+-1x-3.75=0

Solution for x^2+-1x-3.75=0 equation:

Simplifying
x2 + -1x + -3.75 = 0

Reorder the terms:
-3.75 + -1x + x2 = 0

Solving
-3.75 + -1x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '3.75' to each side of the equation.
-3.75 + -1x + 3.75 + x2 = 0 + 3.75

Reorder the terms:
-3.75 + 3.75 + -1x + x2 = 0 + 3.75

Combine like terms: -3.75 + 3.75 = 0.00
0.00 + -1x + x2 = 0 + 3.75
-1x + x2 = 0 + 3.75

Combine like terms: 0 + 3.75 = 3.75
-1x + x2 = 3.75

The x term is -1x.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1x + 0.25 + x2 = 3.75 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 3.75 + 0.25

Combine like terms: 3.75 + 0.25 = 4
0.25 + -1x + x2 = 4

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 4

Calculate the square root of the right side: 2

Break this problem into two subproblems by setting 
(x + -0.5) equal to 2 and -2.

Subproblem 1
x + -0.5 = 2

Simplifying
x + -0.5 = 2

Reorder the terms:
-0.5 + x = 2

Solving
-0.5 + x = 2

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '0.5' to each side of the equation.
-0.5 + 0.5 + x = 2 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + x = 2 + 0.5
x = 2 + 0.5

Combine like terms: 2 + 0.5 = 2.5
x = 2.5

Simplifying
x = 2.5

Subproblem 2
x + -0.5 = -2

Simplifying
x + -0.5 = -2

Reorder the terms:
-0.5 + x = -2

Solving
-0.5 + x = -2

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '0.5' to each side of the equation.
-0.5 + 0.5 + x = -2 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + x = -2 + 0.5
x = -2 + 0.5

Combine like terms: -2 + 0.5 = -1.5
x = -1.5

Simplifying
x = -1.5

Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {2.5, -1.5}