2x^2-6x+9=340

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Solution for 2x^2-6x+9=340 equation:


Simplifying
2x2 + -6x + 9 = 340

Reorder the terms:
9 + -6x + 2x2 = 340

Solving
9 + -6x + 2x2 = 340

Solving for variable 'x'.

Reorder the terms:
9 + -340 + -6x + 2x2 = 340 + -340

Combine like terms: 9 + -340 = -331
-331 + -6x + 2x2 = 340 + -340

Combine like terms: 340 + -340 = 0
-331 + -6x + 2x2 = 0

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

Divide each side by '2'.
-165.5 + -3x + x2 = 0

Move the constant term to the right:

Add '165.5' to each side of the equation.
-165.5 + -3x + 165.5 + x2 = 0 + 165.5

Reorder the terms:
-165.5 + 165.5 + -3x + x2 = 0 + 165.5

Combine like terms: -165.5 + 165.5 = 0.0
0.0 + -3x + x2 = 0 + 165.5
-3x + x2 = 0 + 165.5

Combine like terms: 0 + 165.5 = 165.5
-3x + x2 = 165.5

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 165.5 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 165.5 + 2.25

Combine like terms: 165.5 + 2.25 = 167.75
2.25 + -3x + x2 = 167.75

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 167.75

Calculate the square root of the right side: 12.951833847

Break this problem into two subproblems by setting 
(x + -1.5) equal to 12.951833847 and -12.951833847.

Subproblem 1

x + -1.5 = 12.951833847 Simplifying x + -1.5 = 12.951833847 Reorder the terms: -1.5 + x = 12.951833847 Solving -1.5 + x = 12.951833847 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 12.951833847 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 12.951833847 + 1.5 x = 12.951833847 + 1.5 Combine like terms: 12.951833847 + 1.5 = 14.451833847 x = 14.451833847 Simplifying x = 14.451833847

Subproblem 2

x + -1.5 = -12.951833847 Simplifying x + -1.5 = -12.951833847 Reorder the terms: -1.5 + x = -12.951833847 Solving -1.5 + x = -12.951833847 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -12.951833847 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -12.951833847 + 1.5 x = -12.951833847 + 1.5 Combine like terms: -12.951833847 + 1.5 = -11.451833847 x = -11.451833847 Simplifying x = -11.451833847

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.451833847, -11.451833847}

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