2x^2+9x=6

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Solution for 2x^2+9x=6 equation:


Simplifying
2x2 + 9x = 6

Reorder the terms:
9x + 2x2 = 6

Solving
9x + 2x2 = 6

Solving for variable 'x'.

Reorder the terms:
-6 + 9x + 2x2 = 6 + -6

Combine like terms: 6 + -6 = 0
-6 + 9x + 2x2 = 0

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

Divide each side by '2'.
-3 + 4.5x + x2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + 4.5x + 3 + x2 = 0 + 3

Reorder the terms:
-3 + 3 + 4.5x + x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + 4.5x + x2 = 0 + 3
4.5x + x2 = 0 + 3

Combine like terms: 0 + 3 = 3
4.5x + x2 = 3

The x term is 4.5x.  Take half its coefficient (2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
4.5x + 5.0625 + x2 = 3 + 5.0625

Reorder the terms:
5.0625 + 4.5x + x2 = 3 + 5.0625

Combine like terms: 3 + 5.0625 = 8.0625
5.0625 + 4.5x + x2 = 8.0625

Factor a perfect square on the left side:
(x + 2.25)(x + 2.25) = 8.0625

Calculate the square root of the right side: 2.839454173

Break this problem into two subproblems by setting 
(x + 2.25) equal to 2.839454173 and -2.839454173.

Subproblem 1

x + 2.25 = 2.839454173 Simplifying x + 2.25 = 2.839454173 Reorder the terms: 2.25 + x = 2.839454173 Solving 2.25 + x = 2.839454173 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.25' to each side of the equation. 2.25 + -2.25 + x = 2.839454173 + -2.25 Combine like terms: 2.25 + -2.25 = 0.00 0.00 + x = 2.839454173 + -2.25 x = 2.839454173 + -2.25 Combine like terms: 2.839454173 + -2.25 = 0.589454173 x = 0.589454173 Simplifying x = 0.589454173

Subproblem 2

x + 2.25 = -2.839454173 Simplifying x + 2.25 = -2.839454173 Reorder the terms: 2.25 + x = -2.839454173 Solving 2.25 + x = -2.839454173 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.25' to each side of the equation. 2.25 + -2.25 + x = -2.839454173 + -2.25 Combine like terms: 2.25 + -2.25 = 0.00 0.00 + x = -2.839454173 + -2.25 x = -2.839454173 + -2.25 Combine like terms: -2.839454173 + -2.25 = -5.089454173 x = -5.089454173 Simplifying x = -5.089454173

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.589454173, -5.089454173}

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