-80=0.004x^2-x

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Solution for -80=0.004x^2-x equation:


Simplifying
-80 = 0.004x2 + -1x

Reorder the terms:
-80 = -1x + 0.004x2

Solving
-80 = -1x + 0.004x2

Solving for variable 'x'.

Reorder the terms:
-80 + x + -0.004x2 = -1x + x + 0.004x2 + -0.004x2

Combine like terms: -1x + x = 0
-80 + x + -0.004x2 = 0 + 0.004x2 + -0.004x2
-80 + x + -0.004x2 = 0.004x2 + -0.004x2

Combine like terms: 0.004x2 + -0.004x2 = 0.000
-80 + x + -0.004x2 = 0.000

Begin completing the square.  Divide all terms by
-0.004 the coefficient of the squared term: 

Divide each side by '-0.004'.
20000 + -250x + x2 = 0

Move the constant term to the right:

Add '-20000' to each side of the equation.
20000 + -250x + -20000 + x2 = 0 + -20000

Reorder the terms:
20000 + -20000 + -250x + x2 = 0 + -20000

Combine like terms: 20000 + -20000 = 0
0 + -250x + x2 = 0 + -20000
-250x + x2 = 0 + -20000

Combine like terms: 0 + -20000 = -20000
-250x + x2 = -20000

The x term is x.  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.
-250x + 0.25 + x2 = -20000 + 0.25

Reorder the terms:
0.25 + -250x + x2 = -20000 + 0.25

Combine like terms: -20000 + 0.25 = -19999.75
0.25 + -250x + x2 = -19999.75

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = -19999.75

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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