9x+3x^2=14+x-1

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Solution for 9x+3x^2=14+x-1 equation:


Simplifying
9x + 3x2 = 14 + x + -1

Reorder the terms:
9x + 3x2 = 14 + -1 + x

Combine like terms: 14 + -1 = 13
9x + 3x2 = 13 + x

Solving
9x + 3x2 = 13 + x

Solving for variable 'x'.

Reorder the terms:
-13 + 9x + -1x + 3x2 = 13 + x + -13 + -1x

Combine like terms: 9x + -1x = 8x
-13 + 8x + 3x2 = 13 + x + -13 + -1x

Reorder the terms:
-13 + 8x + 3x2 = 13 + -13 + x + -1x

Combine like terms: 13 + -13 = 0
-13 + 8x + 3x2 = 0 + x + -1x
-13 + 8x + 3x2 = x + -1x

Combine like terms: x + -1x = 0
-13 + 8x + 3x2 = 0

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

Divide each side by '3'.
-4.333333333 + 2.666666667x + x2 = 0

Move the constant term to the right:

Add '4.333333333' to each side of the equation.
-4.333333333 + 2.666666667x + 4.333333333 + x2 = 0 + 4.333333333

Reorder the terms:
-4.333333333 + 4.333333333 + 2.666666667x + x2 = 0 + 4.333333333

Combine like terms: -4.333333333 + 4.333333333 = 0.000000000
0.000000000 + 2.666666667x + x2 = 0 + 4.333333333
2.666666667x + x2 = 0 + 4.333333333

Combine like terms: 0 + 4.333333333 = 4.333333333
2.666666667x + x2 = 4.333333333

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 = 4.333333333 + 1.777777780

Reorder the terms:
1.777777780 + 2.666666667x + x2 = 4.333333333 + 1.777777780

Combine like terms: 4.333333333 + 1.777777780 = 6.111111113
1.777777780 + 2.666666667x + x2 = 6.111111113

Factor a perfect square on the left side:
(x + 1.333333334)(x + 1.333333334) = 6.111111113

Calculate the square root of the right side: 2.472066163

Break this problem into two subproblems by setting 
(x + 1.333333334) equal to 2.472066163 and -2.472066163.

Subproblem 1

x + 1.333333334 = 2.472066163 Simplifying x + 1.333333334 = 2.472066163 Reorder the terms: 1.333333334 + x = 2.472066163 Solving 1.333333334 + x = 2.472066163 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 = 2.472066163 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + x = 2.472066163 + -1.333333334 x = 2.472066163 + -1.333333334 Combine like terms: 2.472066163 + -1.333333334 = 1.138732829 x = 1.138732829 Simplifying x = 1.138732829

Subproblem 2

x + 1.333333334 = -2.472066163 Simplifying x + 1.333333334 = -2.472066163 Reorder the terms: 1.333333334 + x = -2.472066163 Solving 1.333333334 + x = -2.472066163 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 = -2.472066163 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + x = -2.472066163 + -1.333333334 x = -2.472066163 + -1.333333334 Combine like terms: -2.472066163 + -1.333333334 = -3.805399497 x = -3.805399497 Simplifying x = -3.805399497

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.138732829, -3.805399497}

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