-3x^2+8x+96=0

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Solution for -3x^2+8x+96=0 equation:


Simplifying
-3x2 + 8x + 96 = 0

Reorder the terms:
96 + 8x + -3x2 = 0

Solving
96 + 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'.
-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 = 7.145198592 x = 7.145198592 Simplifying x = 7.145198592

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 = -4.478531924 x = -4.478531924 Simplifying x = -4.478531924

Solution

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

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