0=3X^2-12X+7

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Solution for 0=3X^2-12X+7 equation:


Simplifying
0 = 3X2 + -12X + 7

Reorder the terms:
0 = 7 + -12X + 3X2

Solving
0 = 7 + -12X + 3X2

Solving for variable 'X'.

Combine like terms: 0 + -7 = -7
-7 + 12X + -3X2 = 7 + -12X + 3X2 + -7 + 12X + -3X2

Reorder the terms:
-7 + 12X + -3X2 = 7 + -7 + -12X + 12X + 3X2 + -3X2

Combine like terms: 7 + -7 = 0
-7 + 12X + -3X2 = 0 + -12X + 12X + 3X2 + -3X2
-7 + 12X + -3X2 = -12X + 12X + 3X2 + -3X2

Combine like terms: -12X + 12X = 0
-7 + 12X + -3X2 = 0 + 3X2 + -3X2
-7 + 12X + -3X2 = 3X2 + -3X2

Combine like terms: 3X2 + -3X2 = 0
-7 + 12X + -3X2 = 0

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

Divide each side by '-3'.
2.333333333 + -4X + X2 = 0

Move the constant term to the right:

Add '-2.333333333' to each side of the equation.
2.333333333 + -4X + -2.333333333 + X2 = 0 + -2.333333333

Reorder the terms:
2.333333333 + -2.333333333 + -4X + X2 = 0 + -2.333333333

Combine like terms: 2.333333333 + -2.333333333 = 0.000000000
0.000000000 + -4X + X2 = 0 + -2.333333333
-4X + X2 = 0 + -2.333333333

Combine like terms: 0 + -2.333333333 = -2.333333333
-4X + X2 = -2.333333333

The X term is -4X.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4X + 4 + X2 = -2.333333333 + 4

Reorder the terms:
4 + -4X + X2 = -2.333333333 + 4

Combine like terms: -2.333333333 + 4 = 1.666666667
4 + -4X + X2 = 1.666666667

Factor a perfect square on the left side:
(X + -2)(X + -2) = 1.666666667

Calculate the square root of the right side: 1.290994449

Break this problem into two subproblems by setting 
(X + -2) equal to 1.290994449 and -1.290994449.

Subproblem 1

X + -2 = 1.290994449 Simplifying X + -2 = 1.290994449 Reorder the terms: -2 + X = 1.290994449 Solving -2 + X = 1.290994449 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + X = 1.290994449 + 2 Combine like terms: -2 + 2 = 0 0 + X = 1.290994449 + 2 X = 1.290994449 + 2 Combine like terms: 1.290994449 + 2 = 3.290994449 X = 3.290994449 Simplifying X = 3.290994449

Subproblem 2

X + -2 = -1.290994449 Simplifying X + -2 = -1.290994449 Reorder the terms: -2 + X = -1.290994449 Solving -2 + X = -1.290994449 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + X = -1.290994449 + 2 Combine like terms: -2 + 2 = 0 0 + X = -1.290994449 + 2 X = -1.290994449 + 2 Combine like terms: -1.290994449 + 2 = 0.709005551 X = 0.709005551 Simplifying X = 0.709005551

Solution

The solution to the problem is based on the solutions from the subproblems. X = {3.290994449, 0.709005551}

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