3x^2+3x-64=0

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Solution for 3x^2+3x-64=0 equation:


Simplifying
3x2 + 3x + -64 = 0

Reorder the terms:
-64 + 3x + 3x2 = 0

Solving
-64 + 3x + 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'.
-21.33333333 + x + x2 = 0

Move the constant term to the right:

Add '21.33333333' to each side of the equation.
-21.33333333 + x + 21.33333333 + x2 = 0 + 21.33333333

Reorder the terms:
-21.33333333 + 21.33333333 + x + x2 = 0 + 21.33333333

Combine like terms: -21.33333333 + 21.33333333 = 0.00000000
0.00000000 + x + x2 = 0 + 21.33333333
x + x2 = 0 + 21.33333333

Combine like terms: 0 + 21.33333333 = 21.33333333
x + x2 = 21.33333333

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + x2 = 21.33333333 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 21.33333333 + 0.25

Combine like terms: 21.33333333 + 0.25 = 21.58333333
1.25 + x2 = 21.58333333

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 21.58333333

Calculate the square root of the right side: 4.645786621

Break this problem into two subproblems by setting 
(x + 0.5) equal to 4.645786621 and -4.645786621.

Subproblem 1

x + 0.5 = 4.645786621 Simplifying x + 0.5 = 4.645786621 Reorder the terms: 0.5 + x = 4.645786621 Solving 0.5 + x = 4.645786621 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 4.645786621 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 4.645786621 + -0.5 x = 4.645786621 + -0.5 Combine like terms: 4.645786621 + -0.5 = 4.145786621 x = 4.145786621 Simplifying x = 4.145786621

Subproblem 2

x + 0.5 = -4.645786621 Simplifying x + 0.5 = -4.645786621 Reorder the terms: 0.5 + x = -4.645786621 Solving 0.5 + x = -4.645786621 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -4.645786621 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -4.645786621 + -0.5 x = -4.645786621 + -0.5 Combine like terms: -4.645786621 + -0.5 = -5.145786621 x = -5.145786621 Simplifying x = -5.145786621

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.145786621, -5.145786621}

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