-3x^2+11x+12=0

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Solution for -3x^2+11x+12=0 equation:


Simplifying
-3x2 + 11x + 12 = 0

Reorder the terms:
12 + 11x + -3x2 = 0

Solving
12 + 11x + -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'.
-4 + -3.666666667x + x2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + -3.666666667x + 4 + x2 = 0 + 4

Reorder the terms:
-4 + 4 + -3.666666667x + x2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -3.666666667x + x2 = 0 + 4
-3.666666667x + x2 = 0 + 4

Combine like terms: 0 + 4 = 4
-3.666666667x + x2 = 4

The x term is -3.666666667x.  Take half its coefficient (-1.833333334).
Square it (3.361111114) and add it to both sides.

Add '3.361111114' to each side of the equation.
-3.666666667x + 3.361111114 + x2 = 4 + 3.361111114

Reorder the terms:
3.361111114 + -3.666666667x + x2 = 4 + 3.361111114

Combine like terms: 4 + 3.361111114 = 7.361111114
3.361111114 + -3.666666667x + x2 = 7.361111114

Factor a perfect square on the left side:
(x + -1.833333334)(x + -1.833333334) = 7.361111114

Calculate the square root of the right side: 2.713136767

Break this problem into two subproblems by setting 
(x + -1.833333334) equal to 2.713136767 and -2.713136767.

Subproblem 1

x + -1.833333334 = 2.713136767 Simplifying x + -1.833333334 = 2.713136767 Reorder the terms: -1.833333334 + x = 2.713136767 Solving -1.833333334 + x = 2.713136767 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.833333334' to each side of the equation. -1.833333334 + 1.833333334 + x = 2.713136767 + 1.833333334 Combine like terms: -1.833333334 + 1.833333334 = 0.000000000 0.000000000 + x = 2.713136767 + 1.833333334 x = 2.713136767 + 1.833333334 Combine like terms: 2.713136767 + 1.833333334 = 4.546470101 x = 4.546470101 Simplifying x = 4.546470101

Subproblem 2

x + -1.833333334 = -2.713136767 Simplifying x + -1.833333334 = -2.713136767 Reorder the terms: -1.833333334 + x = -2.713136767 Solving -1.833333334 + x = -2.713136767 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.833333334' to each side of the equation. -1.833333334 + 1.833333334 + x = -2.713136767 + 1.833333334 Combine like terms: -1.833333334 + 1.833333334 = 0.000000000 0.000000000 + x = -2.713136767 + 1.833333334 x = -2.713136767 + 1.833333334 Combine like terms: -2.713136767 + 1.833333334 = -0.879803433 x = -0.879803433 Simplifying x = -0.879803433

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.546470101, -0.879803433}

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