0=3x^2+8x-112

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Solution for 0=3x^2+8x-112 equation:


Simplifying
0 = 3x2 + 8x + -112

Reorder the terms:
0 = -112 + 8x + 3x2

Solving
0 = -112 + 8x + 3x2

Solving for variable 'x'.

Combine like terms: 0 + 112 = 112
112 + -8x + -3x2 = -112 + 8x + 3x2 + 112 + -8x + -3x2

Reorder the terms:
112 + -8x + -3x2 = -112 + 112 + 8x + -8x + 3x2 + -3x2

Combine like terms: -112 + 112 = 0
112 + -8x + -3x2 = 0 + 8x + -8x + 3x2 + -3x2
112 + -8x + -3x2 = 8x + -8x + 3x2 + -3x2

Combine like terms: 8x + -8x = 0
112 + -8x + -3x2 = 0 + 3x2 + -3x2
112 + -8x + -3x2 = 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
112 + -8x + -3x2 = 0

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

Divide each side by '-3'.
-37.33333333 + 2.666666667x + x2 = 0

Move the constant term to the right:

Add '37.33333333' to each side of the equation.
-37.33333333 + 2.666666667x + 37.33333333 + x2 = 0 + 37.33333333

Reorder the terms:
-37.33333333 + 37.33333333 + 2.666666667x + x2 = 0 + 37.33333333

Combine like terms: -37.33333333 + 37.33333333 = 0.00000000
0.00000000 + 2.666666667x + x2 = 0 + 37.33333333
2.666666667x + x2 = 0 + 37.33333333

Combine like terms: 0 + 37.33333333 = 37.33333333
2.666666667x + x2 = 37.33333333

The x term is 2.666666667x.  Take half its coefficient (1.333333334).
Square it (1.777777780) and add it to both sides.

Add '1.777777780' to each side of the equation.
2.666666667x + 1.777777780 + x2 = 37.33333333 + 1.777777780

Reorder the terms:
1.777777780 + 2.666666667x + x2 = 37.33333333 + 1.777777780

Combine like terms: 37.33333333 + 1.777777780 = 39.11111111
1.777777780 + 2.666666667x + x2 = 39.11111111

Factor a perfect square on the left side:
(x + 1.333333334)(x + 1.333333334) = 39.11111111

Calculate the square root of the right side: 6.25388768

Break this problem into two subproblems by setting 
(x + 1.333333334) equal to 6.25388768 and -6.25388768.

Subproblem 1

x + 1.333333334 = 6.25388768 Simplifying x + 1.333333334 = 6.25388768 Reorder the terms: 1.333333334 + x = 6.25388768 Solving 1.333333334 + x = 6.25388768 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.333333334' to each side of the equation. 1.333333334 + -1.333333334 + x = 6.25388768 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + x = 6.25388768 + -1.333333334 x = 6.25388768 + -1.333333334 Combine like terms: 6.25388768 + -1.333333334 = 4.920554346 x = 4.920554346 Simplifying x = 4.920554346

Subproblem 2

x + 1.333333334 = -6.25388768 Simplifying x + 1.333333334 = -6.25388768 Reorder the terms: 1.333333334 + x = -6.25388768 Solving 1.333333334 + x = -6.25388768 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.333333334' to each side of the equation. 1.333333334 + -1.333333334 + x = -6.25388768 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + x = -6.25388768 + -1.333333334 x = -6.25388768 + -1.333333334 Combine like terms: -6.25388768 + -1.333333334 = -7.587221014 x = -7.587221014 Simplifying x = -7.587221014

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.920554346, -7.587221014}

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