-0.25x^2-x+4=8

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Solution for -0.25x^2-x+4=8 equation:


Simplifying
-0.25x2 + -1x + 4 = 8

Reorder the terms:
4 + -1x + -0.25x2 = 8

Solving
4 + -1x + -0.25x2 = 8

Solving for variable 'x'.

Reorder the terms:
4 + -8 + -1x + -0.25x2 = 8 + -8

Combine like terms: 4 + -8 = -4
-4 + -1x + -0.25x2 = 8 + -8

Combine like terms: 8 + -8 = 0
-4 + -1x + -0.25x2 = 0

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

Divide each side by '-0.25'.
16 + 4x + x2 = 0

Move the constant term to the right:

Add '-16' to each side of the equation.
16 + 4x + -16 + x2 = 0 + -16

Reorder the terms:
16 + -16 + 4x + x2 = 0 + -16

Combine like terms: 16 + -16 = 0
0 + 4x + x2 = 0 + -16
4x + x2 = 0 + -16

Combine like terms: 0 + -16 = -16
4x + x2 = -16

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 = -16 + 4

Reorder the terms:
4 + 4x + x2 = -16 + 4

Combine like terms: -16 + 4 = -12
4 + 4x + x2 = -12

Factor a perfect square on the left side:
(x + 2)(x + 2) = -12

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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