.8=3x-5x^2

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Solution for .8=3x-5x^2 equation:


Simplifying
0.8 = 3x + -5x2

Solving
0.8 = 3x + -5x2

Solving for variable 'x'.

Reorder the terms:
0.8 + -3x + 5x2 = 3x + -3x + -5x2 + 5x2

Combine like terms: 3x + -3x = 0
0.8 + -3x + 5x2 = 0 + -5x2 + 5x2
0.8 + -3x + 5x2 = -5x2 + 5x2

Combine like terms: -5x2 + 5x2 = 0
0.8 + -3x + 5x2 = 0

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

Divide each side by '5'.
0.16 + -0.6x + x2 = 0

Move the constant term to the right:

Add '-0.16' to each side of the equation.
0.16 + -0.6x + -0.16 + x2 = 0 + -0.16

Reorder the terms:
0.16 + -0.16 + -0.6x + x2 = 0 + -0.16

Combine like terms: 0.16 + -0.16 = 0.00
0.00 + -0.6x + x2 = 0 + -0.16
-0.6x + x2 = 0 + -0.16

Combine like terms: 0 + -0.16 = -0.16
-0.6x + x2 = -0.16

The x term is -0.6x.  Take half its coefficient (-0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
-0.6x + 0.09 + x2 = -0.16 + 0.09

Reorder the terms:
0.09 + -0.6x + x2 = -0.16 + 0.09

Combine like terms: -0.16 + 0.09 = -0.07
0.09 + -0.6x + x2 = -0.07

Factor a perfect square on the left side:
(x + -0.3)(x + -0.3) = -0.07

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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