3x^2+8x-376=0

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Solution for 3x^2+8x-376=0 equation:


Simplifying
3x2 + 8x + -376 = 0

Reorder the terms:
-376 + 8x + 3x2 = 0

Solving
-376 + 8x + 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'.
-125.3333333 + 2.666666667x + x2 = 0

Move the constant term to the right:

Add '125.3333333' to each side of the equation.
-125.3333333 + 2.666666667x + 125.3333333 + x2 = 0 + 125.3333333

Reorder the terms:
-125.3333333 + 125.3333333 + 2.666666667x + x2 = 0 + 125.3333333

Combine like terms: -125.3333333 + 125.3333333 = 0.0000000
0.0000000 + 2.666666667x + x2 = 0 + 125.3333333
2.666666667x + x2 = 0 + 125.3333333

Combine like terms: 0 + 125.3333333 = 125.3333333
2.666666667x + x2 = 125.3333333

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 = 125.3333333 + 1.777777780

Reorder the terms:
1.777777780 + 2.666666667x + x2 = 125.3333333 + 1.777777780

Combine like terms: 125.3333333 + 1.777777780 = 127.11111108
1.777777780 + 2.666666667x + x2 = 127.11111108

Factor a perfect square on the left side:
(x + 1.333333334)(x + 1.333333334) = 127.11111108

Calculate the square root of the right side: 11.274356349

Break this problem into two subproblems by setting 
(x + 1.333333334) equal to 11.274356349 and -11.274356349.

Subproblem 1

x + 1.333333334 = 11.274356349 Simplifying x + 1.333333334 = 11.274356349 Reorder the terms: 1.333333334 + x = 11.274356349 Solving 1.333333334 + x = 11.274356349 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 = 11.274356349 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + x = 11.274356349 + -1.333333334 x = 11.274356349 + -1.333333334 Combine like terms: 11.274356349 + -1.333333334 = 9.941023015 x = 9.941023015 Simplifying x = 9.941023015

Subproblem 2

x + 1.333333334 = -11.274356349 Simplifying x + 1.333333334 = -11.274356349 Reorder the terms: 1.333333334 + x = -11.274356349 Solving 1.333333334 + x = -11.274356349 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 = -11.274356349 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + x = -11.274356349 + -1.333333334 x = -11.274356349 + -1.333333334 Combine like terms: -11.274356349 + -1.333333334 = -12.607689683 x = -12.607689683 Simplifying x = -12.607689683

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.941023015, -12.607689683}

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