4X^2-12X-19=0

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Solution for 4X^2-12X-19=0 equation:


Simplifying
4X2 + -12X + -19 = 0

Reorder the terms:
-19 + -12X + 4X2 = 0

Solving
-19 + -12X + 4X2 = 0

Solving for variable 'X'.

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

Divide each side by '4'.
-4.75 + -3X + X2 = 0

Move the constant term to the right:

Add '4.75' to each side of the equation.
-4.75 + -3X + 4.75 + X2 = 0 + 4.75

Reorder the terms:
-4.75 + 4.75 + -3X + X2 = 0 + 4.75

Combine like terms: -4.75 + 4.75 = 0.00
0.00 + -3X + X2 = 0 + 4.75
-3X + X2 = 0 + 4.75

Combine like terms: 0 + 4.75 = 4.75
-3X + X2 = 4.75

The X term is -3X.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3X + 2.25 + X2 = 4.75 + 2.25

Reorder the terms:
2.25 + -3X + X2 = 4.75 + 2.25

Combine like terms: 4.75 + 2.25 = 7
2.25 + -3X + X2 = 7

Factor a perfect square on the left side:
(X + -1.5)(X + -1.5) = 7

Calculate the square root of the right side: 2.645751311

Break this problem into two subproblems by setting 
(X + -1.5) equal to 2.645751311 and -2.645751311.

Subproblem 1

X + -1.5 = 2.645751311 Simplifying X + -1.5 = 2.645751311 Reorder the terms: -1.5 + X = 2.645751311 Solving -1.5 + X = 2.645751311 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + X = 2.645751311 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + X = 2.645751311 + 1.5 X = 2.645751311 + 1.5 Combine like terms: 2.645751311 + 1.5 = 4.145751311 X = 4.145751311 Simplifying X = 4.145751311

Subproblem 2

X + -1.5 = -2.645751311 Simplifying X + -1.5 = -2.645751311 Reorder the terms: -1.5 + X = -2.645751311 Solving -1.5 + X = -2.645751311 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + X = -2.645751311 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + X = -2.645751311 + 1.5 X = -2.645751311 + 1.5 Combine like terms: -2.645751311 + 1.5 = -1.145751311 X = -1.145751311 Simplifying X = -1.145751311

Solution

The solution to the problem is based on the solutions from the subproblems. X = {4.145751311, -1.145751311}

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