704=10.8x-0.4x^2

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Solution for 704=10.8x-0.4x^2 equation:


Simplifying
704 = 10.8x + -0.4x2

Solving
704 = 10.8x + -0.4x2

Solving for variable 'x'.

Reorder the terms:
704 + -10.8x + 0.4x2 = 10.8x + -10.8x + -0.4x2 + 0.4x2

Combine like terms: 10.8x + -10.8x = 0.0
704 + -10.8x + 0.4x2 = 0.0 + -0.4x2 + 0.4x2
704 + -10.8x + 0.4x2 = -0.4x2 + 0.4x2

Combine like terms: -0.4x2 + 0.4x2 = 0.0
704 + -10.8x + 0.4x2 = 0.0

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

Divide each side by '0.4'.
1760 + -27x + x2 = 0

Move the constant term to the right:

Add '-1760' to each side of the equation.
1760 + -27x + -1760 + x2 = 0 + -1760

Reorder the terms:
1760 + -1760 + -27x + x2 = 0 + -1760

Combine like terms: 1760 + -1760 = 0
0 + -27x + x2 = 0 + -1760
-27x + x2 = 0 + -1760

Combine like terms: 0 + -1760 = -1760
-27x + x2 = -1760

The x term is -27x.  Take half its coefficient (-13.5).
Square it (182.25) and add it to both sides.

Add '182.25' to each side of the equation.
-27x + 182.25 + x2 = -1760 + 182.25

Reorder the terms:
182.25 + -27x + x2 = -1760 + 182.25

Combine like terms: -1760 + 182.25 = -1577.75
182.25 + -27x + x2 = -1577.75

Factor a perfect square on the left side:
(x + -13.5)(x + -13.5) = -1577.75

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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