2x^2-20x+9=6

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Solution for 2x^2-20x+9=6 equation:


Simplifying
2x2 + -20x + 9 = 6

Reorder the terms:
9 + -20x + 2x2 = 6

Solving
9 + -20x + 2x2 = 6

Solving for variable 'x'.

Reorder the terms:
9 + -6 + -20x + 2x2 = 6 + -6

Combine like terms: 9 + -6 = 3
3 + -20x + 2x2 = 6 + -6

Combine like terms: 6 + -6 = 0
3 + -20x + 2x2 = 0

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

Divide each side by '2'.
1.5 + -10x + x2 = 0

Move the constant term to the right:

Add '-1.5' to each side of the equation.
1.5 + -10x + -1.5 + x2 = 0 + -1.5

Reorder the terms:
1.5 + -1.5 + -10x + x2 = 0 + -1.5

Combine like terms: 1.5 + -1.5 = 0.0
0.0 + -10x + x2 = 0 + -1.5
-10x + x2 = 0 + -1.5

Combine like terms: 0 + -1.5 = -1.5
-10x + x2 = -1.5

The x term is -10x.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10x + 25 + x2 = -1.5 + 25

Reorder the terms:
25 + -10x + x2 = -1.5 + 25

Combine like terms: -1.5 + 25 = 23.5
25 + -10x + x2 = 23.5

Factor a perfect square on the left side:
(x + -5)(x + -5) = 23.5

Calculate the square root of the right side: 4.847679857

Break this problem into two subproblems by setting 
(x + -5) equal to 4.847679857 and -4.847679857.

Subproblem 1

x + -5 = 4.847679857 Simplifying x + -5 = 4.847679857 Reorder the terms: -5 + x = 4.847679857 Solving -5 + x = 4.847679857 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = 4.847679857 + 5 Combine like terms: -5 + 5 = 0 0 + x = 4.847679857 + 5 x = 4.847679857 + 5 Combine like terms: 4.847679857 + 5 = 9.847679857 x = 9.847679857 Simplifying x = 9.847679857

Subproblem 2

x + -5 = -4.847679857 Simplifying x + -5 = -4.847679857 Reorder the terms: -5 + x = -4.847679857 Solving -5 + x = -4.847679857 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = -4.847679857 + 5 Combine like terms: -5 + 5 = 0 0 + x = -4.847679857 + 5 x = -4.847679857 + 5 Combine like terms: -4.847679857 + 5 = 0.152320143 x = 0.152320143 Simplifying x = 0.152320143

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.847679857, 0.152320143}

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