-0.25x^2-x-1=0

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Solution for -0.25x^2-x-1=0 equation:


Simplifying
-0.25x2 + -1x + -1 = 0

Reorder the terms:
-1 + -1x + -0.25x2 = 0

Solving
-1 + -1x + -0.25x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-0.25 the coefficient of the squared term: 

Divide each side by '-0.25'.
4 + 4x + x2 = 0

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + 4x + -4 + x2 = 0 + -4

Reorder the terms:
4 + -4 + 4x + x2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + 4x + x2 = 0 + -4
4x + x2 = 0 + -4

Combine like terms: 0 + -4 = -4
4x + x2 = -4

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = -4 + 4

Reorder the terms:
4 + 4x + x2 = -4 + 4

Combine like terms: -4 + 4 = 0
4 + 4x + x2 = 0

Factor a perfect square on the left side:
(x + 2)(x + 2) = 0

Calculate the square root of the right side: 0

Break this problem into two subproblems by setting 
(x + 2) equal to 0 and 0.

Subproblem 1

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

Subproblem 2

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

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-2, -2}

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