3x^2-20x-384=0

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Solution for 3x^2-20x-384=0 equation:


Simplifying
3x2 + -20x + -384 = 0

Reorder the terms:
-384 + -20x + 3x2 = 0

Solving
-384 + -20x + 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'.
-128 + -6.666666667x + x2 = 0

Move the constant term to the right:

Add '128' to each side of the equation.
-128 + -6.666666667x + 128 + x2 = 0 + 128

Reorder the terms:
-128 + 128 + -6.666666667x + x2 = 0 + 128

Combine like terms: -128 + 128 = 0
0 + -6.666666667x + x2 = 0 + 128
-6.666666667x + x2 = 0 + 128

Combine like terms: 0 + 128 = 128
-6.666666667x + x2 = 128

The x term is -6.666666667x.  Take half its coefficient (-3.333333334).
Square it (11.11111112) and add it to both sides.

Add '11.11111112' to each side of the equation.
-6.666666667x + 11.11111112 + x2 = 128 + 11.11111112

Reorder the terms:
11.11111112 + -6.666666667x + x2 = 128 + 11.11111112

Combine like terms: 128 + 11.11111112 = 139.11111112
11.11111112 + -6.666666667x + x2 = 139.11111112

Factor a perfect square on the left side:
(x + -3.333333334)(x + -3.333333334) = 139.11111112

Calculate the square root of the right side: 11.794537342

Break this problem into two subproblems by setting 
(x + -3.333333334) equal to 11.794537342 and -11.794537342.

Subproblem 1

x + -3.333333334 = 11.794537342 Simplifying x + -3.333333334 = 11.794537342 Reorder the terms: -3.333333334 + x = 11.794537342 Solving -3.333333334 + x = 11.794537342 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.333333334' to each side of the equation. -3.333333334 + 3.333333334 + x = 11.794537342 + 3.333333334 Combine like terms: -3.333333334 + 3.333333334 = 0.000000000 0.000000000 + x = 11.794537342 + 3.333333334 x = 11.794537342 + 3.333333334 Combine like terms: 11.794537342 + 3.333333334 = 15.127870676 x = 15.127870676 Simplifying x = 15.127870676

Subproblem 2

x + -3.333333334 = -11.794537342 Simplifying x + -3.333333334 = -11.794537342 Reorder the terms: -3.333333334 + x = -11.794537342 Solving -3.333333334 + x = -11.794537342 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.333333334' to each side of the equation. -3.333333334 + 3.333333334 + x = -11.794537342 + 3.333333334 Combine like terms: -3.333333334 + 3.333333334 = 0.000000000 0.000000000 + x = -11.794537342 + 3.333333334 x = -11.794537342 + 3.333333334 Combine like terms: -11.794537342 + 3.333333334 = -8.461204008 x = -8.461204008 Simplifying x = -8.461204008

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.127870676, -8.461204008}

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