X=-3.6X^2-8.8X+8.3

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Solution for X=-3.6X^2-8.8X+8.3 equation:


Simplifying
X = -3.6X2 + -8.8X + 8.3

Reorder the terms:
X = 8.3 + -8.8X + -3.6X2

Solving
X = 8.3 + -8.8X + -3.6X2

Solving for variable 'X'.

Reorder the terms:
-8.3 + X + 8.8X + 3.6X2 = 8.3 + -8.8X + -3.6X2 + -8.3 + 8.8X + 3.6X2

Combine like terms: X + 8.8X = 9.8X
-8.3 + 9.8X + 3.6X2 = 8.3 + -8.8X + -3.6X2 + -8.3 + 8.8X + 3.6X2

Reorder the terms:
-8.3 + 9.8X + 3.6X2 = 8.3 + -8.3 + -8.8X + 8.8X + -3.6X2 + 3.6X2

Combine like terms: 8.3 + -8.3 = 0.0
-8.3 + 9.8X + 3.6X2 = 0.0 + -8.8X + 8.8X + -3.6X2 + 3.6X2
-8.3 + 9.8X + 3.6X2 = -8.8X + 8.8X + -3.6X2 + 3.6X2

Combine like terms: -8.8X + 8.8X = 0.0
-8.3 + 9.8X + 3.6X2 = 0.0 + -3.6X2 + 3.6X2
-8.3 + 9.8X + 3.6X2 = -3.6X2 + 3.6X2

Combine like terms: -3.6X2 + 3.6X2 = 0.0
-8.3 + 9.8X + 3.6X2 = 0.0

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

Divide each side by '3.6'.
-2.305555556 + 2.722222222X + X2 = 0

Move the constant term to the right:

Add '2.305555556' to each side of the equation.
-2.305555556 + 2.722222222X + 2.305555556 + X2 = 0 + 2.305555556

Reorder the terms:
-2.305555556 + 2.305555556 + 2.722222222X + X2 = 0 + 2.305555556

Combine like terms: -2.305555556 + 2.305555556 = 0.000000000
0.000000000 + 2.722222222X + X2 = 0 + 2.305555556
2.722222222X + X2 = 0 + 2.305555556

Combine like terms: 0 + 2.305555556 = 2.305555556
2.722222222X + X2 = 2.305555556

The X term is 2.722222222X.  Take half its coefficient (1.361111111).
Square it (1.852623456) and add it to both sides.

Add '1.852623456' to each side of the equation.
2.722222222X + 1.852623456 + X2 = 2.305555556 + 1.852623456

Reorder the terms:
1.852623456 + 2.722222222X + X2 = 2.305555556 + 1.852623456

Combine like terms: 2.305555556 + 1.852623456 = 4.158179012
1.852623456 + 2.722222222X + X2 = 4.158179012

Factor a perfect square on the left side:
(X + 1.361111111)(X + 1.361111111) = 4.158179012

Calculate the square root of the right side: 2.03916135

Break this problem into two subproblems by setting 
(X + 1.361111111) equal to 2.03916135 and -2.03916135.

Subproblem 1

X + 1.361111111 = 2.03916135 Simplifying X + 1.361111111 = 2.03916135 Reorder the terms: 1.361111111 + X = 2.03916135 Solving 1.361111111 + X = 2.03916135 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-1.361111111' to each side of the equation. 1.361111111 + -1.361111111 + X = 2.03916135 + -1.361111111 Combine like terms: 1.361111111 + -1.361111111 = 0.000000000 0.000000000 + X = 2.03916135 + -1.361111111 X = 2.03916135 + -1.361111111 Combine like terms: 2.03916135 + -1.361111111 = 0.678050239 X = 0.678050239 Simplifying X = 0.678050239

Subproblem 2

X + 1.361111111 = -2.03916135 Simplifying X + 1.361111111 = -2.03916135 Reorder the terms: 1.361111111 + X = -2.03916135 Solving 1.361111111 + X = -2.03916135 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-1.361111111' to each side of the equation. 1.361111111 + -1.361111111 + X = -2.03916135 + -1.361111111 Combine like terms: 1.361111111 + -1.361111111 = 0.000000000 0.000000000 + X = -2.03916135 + -1.361111111 X = -2.03916135 + -1.361111111 Combine like terms: -2.03916135 + -1.361111111 = -3.400272461 X = -3.400272461 Simplifying X = -3.400272461

Solution

The solution to the problem is based on the solutions from the subproblems. X = {0.678050239, -3.400272461}

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