0=-X^2-X+3.55

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


Simplifying
0 = -1X2 + -1X + 3.55

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

Solving
0 = 3.55 + -1X + -1X2

Solving for variable 'X'.

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

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

Combine like terms: 3.55 + -3.55 = 0.00
-3.55 + X + X2 = 0.00 + -1X + X + -1X2 + X2
-3.55 + X + X2 = -1X + X + -1X2 + X2

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

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

Begin completing the square.

Move the constant term to the right:

Add '3.55' to each side of the equation.
-3.55 + X + 3.55 + X2 = 0 + 3.55

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

Combine like terms: -3.55 + 3.55 = 0.00
0.00 + X + X2 = 0 + 3.55
X + X2 = 0 + 3.55

Combine like terms: 0 + 3.55 = 3.55
X + X2 = 3.55

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.
X + 0.25 + X2 = 3.55 + 0.25

Reorder the terms:
0.25 + X + X2 = 3.55 + 0.25

Combine like terms: 3.55 + 0.25 = 3.8
0.25 + X + X2 = 3.8

Factor a perfect square on the left side:
(X + 0.5)(X + 0.5) = 3.8

Calculate the square root of the right side: 1.949358869

Break this problem into two subproblems by setting 
(X + 0.5) equal to 1.949358869 and -1.949358869.

Subproblem 1

X + 0.5 = 1.949358869 Simplifying X + 0.5 = 1.949358869 Reorder the terms: 0.5 + X = 1.949358869 Solving 0.5 + X = 1.949358869 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + X = 1.949358869 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + X = 1.949358869 + -0.5 X = 1.949358869 + -0.5 Combine like terms: 1.949358869 + -0.5 = 1.449358869 X = 1.449358869 Simplifying X = 1.449358869

Subproblem 2

X + 0.5 = -1.949358869 Simplifying X + 0.5 = -1.949358869 Reorder the terms: 0.5 + X = -1.949358869 Solving 0.5 + X = -1.949358869 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + X = -1.949358869 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + X = -1.949358869 + -0.5 X = -1.949358869 + -0.5 Combine like terms: -1.949358869 + -0.5 = -2.449358869 X = -2.449358869 Simplifying X = -2.449358869

Solution

The solution to the problem is based on the solutions from the subproblems. X = {1.449358869, -2.449358869}

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