2.840=1.2x-0.2x^2

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Solution for 2.840=1.2x-0.2x^2 equation:


Simplifying
2.840 = 1.2x + -0.2x2

Solving
2.840 = 1.2x + -0.2x2

Solving for variable 'x'.

Reorder the terms:
2.840 + -1.2x + 0.2x2 = 1.2x + -1.2x + -0.2x2 + 0.2x2

Combine like terms: 1.2x + -1.2x = 0.0
2.840 + -1.2x + 0.2x2 = 0.0 + -0.2x2 + 0.2x2
2.840 + -1.2x + 0.2x2 = -0.2x2 + 0.2x2

Combine like terms: -0.2x2 + 0.2x2 = 0.0
2.840 + -1.2x + 0.2x2 = 0.0

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

Divide each side by '0.2'.
14.2 + -6x + x2 = 0

Move the constant term to the right:

Add '-14.2' to each side of the equation.
14.2 + -6x + -14.2 + x2 = 0 + -14.2

Reorder the terms:
14.2 + -14.2 + -6x + x2 = 0 + -14.2

Combine like terms: 14.2 + -14.2 = 0.0
0.0 + -6x + x2 = 0 + -14.2
-6x + x2 = 0 + -14.2

Combine like terms: 0 + -14.2 = -14.2
-6x + x2 = -14.2

The x term is -6x.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6x + 9 + x2 = -14.2 + 9

Reorder the terms:
9 + -6x + x2 = -14.2 + 9

Combine like terms: -14.2 + 9 = -5.2
9 + -6x + x2 = -5.2

Factor a perfect square on the left side:
(x + -3)(x + -3) = -5.2

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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