3x^2+8x=96

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Solution for 3x^2+8x=96 equation:


Simplifying
3x2 + 8x = 96

Reorder the terms:
8x + 3x2 = 96

Solving
8x + 3x2 = 96

Solving for variable 'x'.

Reorder the terms:
-96 + 8x + 3x2 = 96 + -96

Combine like terms: 96 + -96 = 0
-96 + 8x + 3x2 = 0

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

Divide each side by '3'.
-32 + 2.666666667x + x2 = 0

Move the constant term to the right:

Add '32' to each side of the equation.
-32 + 2.666666667x + 32 + x2 = 0 + 32

Reorder the terms:
-32 + 32 + 2.666666667x + x2 = 0 + 32

Combine like terms: -32 + 32 = 0
0 + 2.666666667x + x2 = 0 + 32
2.666666667x + x2 = 0 + 32

Combine like terms: 0 + 32 = 32
2.666666667x + x2 = 32

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 = 32 + 1.777777780

Reorder the terms:
1.777777780 + 2.666666667x + x2 = 32 + 1.777777780

Combine like terms: 32 + 1.777777780 = 33.77777778
1.777777780 + 2.666666667x + x2 = 33.77777778

Factor a perfect square on the left side:
(x + 1.333333334)(x + 1.333333334) = 33.77777778

Calculate the square root of the right side: 5.811865258

Break this problem into two subproblems by setting 
(x + 1.333333334) equal to 5.811865258 and -5.811865258.

Subproblem 1

x + 1.333333334 = 5.811865258 Simplifying x + 1.333333334 = 5.811865258 Reorder the terms: 1.333333334 + x = 5.811865258 Solving 1.333333334 + x = 5.811865258 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 = 5.811865258 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + x = 5.811865258 + -1.333333334 x = 5.811865258 + -1.333333334 Combine like terms: 5.811865258 + -1.333333334 = 4.478531924 x = 4.478531924 Simplifying x = 4.478531924

Subproblem 2

x + 1.333333334 = -5.811865258 Simplifying x + 1.333333334 = -5.811865258 Reorder the terms: 1.333333334 + x = -5.811865258 Solving 1.333333334 + x = -5.811865258 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 = -5.811865258 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + x = -5.811865258 + -1.333333334 x = -5.811865258 + -1.333333334 Combine like terms: -5.811865258 + -1.333333334 = -7.145198592 x = -7.145198592 Simplifying x = -7.145198592

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.478531924, -7.145198592}

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