3x^2+11x+7=0

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Solution for 3x^2+11x+7=0 equation:


Simplifying
3x2 + 11x + 7 = 0

Reorder the terms:
7 + 11x + 3x2 = 0

Solving
7 + 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'.
2.333333333 + 3.666666667x + x2 = 0

Move the constant term to the right:

Add '-2.333333333' to each side of the equation.
2.333333333 + 3.666666667x + -2.333333333 + x2 = 0 + -2.333333333

Reorder the terms:
2.333333333 + -2.333333333 + 3.666666667x + x2 = 0 + -2.333333333

Combine like terms: 2.333333333 + -2.333333333 = 0.000000000
0.000000000 + 3.666666667x + x2 = 0 + -2.333333333
3.666666667x + x2 = 0 + -2.333333333

Combine like terms: 0 + -2.333333333 = -2.333333333
3.666666667x + x2 = -2.333333333

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 = -2.333333333 + 3.361111114

Reorder the terms:
3.361111114 + 3.666666667x + x2 = -2.333333333 + 3.361111114

Combine like terms: -2.333333333 + 3.361111114 = 1.027777781
3.361111114 + 3.666666667x + x2 = 1.027777781

Factor a perfect square on the left side:
(x + 1.833333334)(x + 1.833333334) = 1.027777781

Calculate the square root of the right side: 1.013793757

Break this problem into two subproblems by setting 
(x + 1.833333334) equal to 1.013793757 and -1.013793757.

Subproblem 1

x + 1.833333334 = 1.013793757 Simplifying x + 1.833333334 = 1.013793757 Reorder the terms: 1.833333334 + x = 1.013793757 Solving 1.833333334 + x = 1.013793757 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 = 1.013793757 + -1.833333334 Combine like terms: 1.833333334 + -1.833333334 = 0.000000000 0.000000000 + x = 1.013793757 + -1.833333334 x = 1.013793757 + -1.833333334 Combine like terms: 1.013793757 + -1.833333334 = -0.819539577 x = -0.819539577 Simplifying x = -0.819539577

Subproblem 2

x + 1.833333334 = -1.013793757 Simplifying x + 1.833333334 = -1.013793757 Reorder the terms: 1.833333334 + x = -1.013793757 Solving 1.833333334 + x = -1.013793757 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 = -1.013793757 + -1.833333334 Combine like terms: 1.833333334 + -1.833333334 = 0.000000000 0.000000000 + x = -1.013793757 + -1.833333334 x = -1.013793757 + -1.833333334 Combine like terms: -1.013793757 + -1.833333334 = -2.847127091 x = -2.847127091 Simplifying x = -2.847127091

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.819539577, -2.847127091}

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