-X^2+(3.55-X)-10=0

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Solution for -X^2+(3.55-X)-10=0 equation:


Simplifying
-1X2 + (3.55 + -1X) + -10 = 0

Remove parenthesis around (3.55 + -1X)
-1X2 + 3.55 + -1X + -10 = 0

Reorder the terms:
3.55 + -10 + -1X + -1X2 = 0

Combine like terms: 3.55 + -10 = -6.45
-6.45 + -1X + -1X2 = 0

Solving
-6.45 + -1X + -1X2 = 0

Solving for variable 'X'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
6.45 + X + X2 = 0

Move the constant term to the right:

Add '-6.45' to each side of the equation.
6.45 + X + -6.45 + X2 = 0 + -6.45

Reorder the terms:
6.45 + -6.45 + X + X2 = 0 + -6.45

Combine like terms: 6.45 + -6.45 = 0.00
0.00 + X + X2 = 0 + -6.45
X + X2 = 0 + -6.45

Combine like terms: 0 + -6.45 = -6.45
X + X2 = -6.45

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.
 + 0.25 + X2 = -6.45 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + X2 = -6.45 + 0.25

Combine like terms: -6.45 + 0.25 = -6.2
1.25 + X2 = -6.2

Factor a perfect square on the left side:
(X + 0.5)(X + 0.5) = -6.2

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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