2x^2-19x+18=0

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Solution for 2x^2-19x+18=0 equation:


Simplifying
2x2 + -19x + 18 = 0

Reorder the terms:
18 + -19x + 2x2 = 0

Solving
18 + -19x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
9 + -9.5x + x2 = 0

Move the constant term to the right:

Add '-9' to each side of the equation.
9 + -9.5x + -9 + x2 = 0 + -9

Reorder the terms:
9 + -9 + -9.5x + x2 = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -9.5x + x2 = 0 + -9
-9.5x + x2 = 0 + -9

Combine like terms: 0 + -9 = -9
-9.5x + x2 = -9

The x term is -9.5x.  Take half its coefficient (-4.75).
Square it (22.5625) and add it to both sides.

Add '22.5625' to each side of the equation.
-9.5x + 22.5625 + x2 = -9 + 22.5625

Reorder the terms:
22.5625 + -9.5x + x2 = -9 + 22.5625

Combine like terms: -9 + 22.5625 = 13.5625
22.5625 + -9.5x + x2 = 13.5625

Factor a perfect square on the left side:
(x + -4.75)(x + -4.75) = 13.5625

Calculate the square root of the right side: 3.682729966

Break this problem into two subproblems by setting 
(x + -4.75) equal to 3.682729966 and -3.682729966.

Subproblem 1

x + -4.75 = 3.682729966 Simplifying x + -4.75 = 3.682729966 Reorder the terms: -4.75 + x = 3.682729966 Solving -4.75 + x = 3.682729966 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.75' to each side of the equation. -4.75 + 4.75 + x = 3.682729966 + 4.75 Combine like terms: -4.75 + 4.75 = 0.00 0.00 + x = 3.682729966 + 4.75 x = 3.682729966 + 4.75 Combine like terms: 3.682729966 + 4.75 = 8.432729966 x = 8.432729966 Simplifying x = 8.432729966

Subproblem 2

x + -4.75 = -3.682729966 Simplifying x + -4.75 = -3.682729966 Reorder the terms: -4.75 + x = -3.682729966 Solving -4.75 + x = -3.682729966 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.75' to each side of the equation. -4.75 + 4.75 + x = -3.682729966 + 4.75 Combine like terms: -4.75 + 4.75 = 0.00 0.00 + x = -3.682729966 + 4.75 x = -3.682729966 + 4.75 Combine like terms: -3.682729966 + 4.75 = 1.067270034 x = 1.067270034 Simplifying x = 1.067270034

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.432729966, 1.067270034}

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