3x^2+168x-1288=0

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Solution for 3x^2+168x-1288=0 equation:


Simplifying
3x2 + 168x + -1288 = 0

Reorder the terms:
-1288 + 168x + 3x2 = 0

Solving
-1288 + 168x + 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'.
-429.3333333 + 56x + x2 = 0

Move the constant term to the right:

Add '429.3333333' to each side of the equation.
-429.3333333 + 56x + 429.3333333 + x2 = 0 + 429.3333333

Reorder the terms:
-429.3333333 + 429.3333333 + 56x + x2 = 0 + 429.3333333

Combine like terms: -429.3333333 + 429.3333333 = 0.0000000
0.0000000 + 56x + x2 = 0 + 429.3333333
56x + x2 = 0 + 429.3333333

Combine like terms: 0 + 429.3333333 = 429.3333333
56x + x2 = 429.3333333

The x term is 56x.  Take half its coefficient (28).
Square it (784) and add it to both sides.

Add '784' to each side of the equation.
56x + 784 + x2 = 429.3333333 + 784

Reorder the terms:
784 + 56x + x2 = 429.3333333 + 784

Combine like terms: 429.3333333 + 784 = 1213.3333333
784 + 56x + x2 = 1213.3333333

Factor a perfect square on the left side:
(x + 28)(x + 28) = 1213.3333333

Calculate the square root of the right side: 34.832934606

Break this problem into two subproblems by setting 
(x + 28) equal to 34.832934606 and -34.832934606.

Subproblem 1

x + 28 = 34.832934606 Simplifying x + 28 = 34.832934606 Reorder the terms: 28 + x = 34.832934606 Solving 28 + x = 34.832934606 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-28' to each side of the equation. 28 + -28 + x = 34.832934606 + -28 Combine like terms: 28 + -28 = 0 0 + x = 34.832934606 + -28 x = 34.832934606 + -28 Combine like terms: 34.832934606 + -28 = 6.832934606 x = 6.832934606 Simplifying x = 6.832934606

Subproblem 2

x + 28 = -34.832934606 Simplifying x + 28 = -34.832934606 Reorder the terms: 28 + x = -34.832934606 Solving 28 + x = -34.832934606 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-28' to each side of the equation. 28 + -28 + x = -34.832934606 + -28 Combine like terms: 28 + -28 = 0 0 + x = -34.832934606 + -28 x = -34.832934606 + -28 Combine like terms: -34.832934606 + -28 = -62.832934606 x = -62.832934606 Simplifying x = -62.832934606

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.832934606, -62.832934606}

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