3X^2-118.5X+328.5=0

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Solution for 3X^2-118.5X+328.5=0 equation:


Simplifying
3X2 + -118.5X + 328.5 = 0

Reorder the terms:
328.5 + -118.5X + 3X2 = 0

Solving
328.5 + -118.5X + 3X2 = 0

Solving for variable 'X'.

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

Divide each side by '3'.
109.5 + -39.5X + X2 = 0

Move the constant term to the right:

Add '-109.5' to each side of the equation.
109.5 + -39.5X + -109.5 + X2 = 0 + -109.5

Reorder the terms:
109.5 + -109.5 + -39.5X + X2 = 0 + -109.5

Combine like terms: 109.5 + -109.5 = 0.0
0.0 + -39.5X + X2 = 0 + -109.5
-39.5X + X2 = 0 + -109.5

Combine like terms: 0 + -109.5 = -109.5
-39.5X + X2 = -109.5

The X term is -39.5X.  Take half its coefficient (-19.75).
Square it (390.0625) and add it to both sides.

Add '390.0625' to each side of the equation.
-39.5X + 390.0625 + X2 = -109.5 + 390.0625

Reorder the terms:
390.0625 + -39.5X + X2 = -109.5 + 390.0625

Combine like terms: -109.5 + 390.0625 = 280.5625
390.0625 + -39.5X + X2 = 280.5625

Factor a perfect square on the left side:
(X + -19.75)(X + -19.75) = 280.5625

Calculate the square root of the right side: 16.75

Break this problem into two subproblems by setting 
(X + -19.75) equal to 16.75 and -16.75.

Subproblem 1

X + -19.75 = 16.75 Simplifying X + -19.75 = 16.75 Reorder the terms: -19.75 + X = 16.75 Solving -19.75 + X = 16.75 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '19.75' to each side of the equation. -19.75 + 19.75 + X = 16.75 + 19.75 Combine like terms: -19.75 + 19.75 = 0.00 0.00 + X = 16.75 + 19.75 X = 16.75 + 19.75 Combine like terms: 16.75 + 19.75 = 36.5 X = 36.5 Simplifying X = 36.5

Subproblem 2

X + -19.75 = -16.75 Simplifying X + -19.75 = -16.75 Reorder the terms: -19.75 + X = -16.75 Solving -19.75 + X = -16.75 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '19.75' to each side of the equation. -19.75 + 19.75 + X = -16.75 + 19.75 Combine like terms: -19.75 + 19.75 = 0.00 0.00 + X = -16.75 + 19.75 X = -16.75 + 19.75 Combine like terms: -16.75 + 19.75 = 3 X = 3 Simplifying X = 3

Solution

The solution to the problem is based on the solutions from the subproblems. X = {36.5, 3}

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