2x^2-17x+28=0

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Solution for 2x^2-17x+28=0 equation:


Simplifying
2x2 + -17x + 28 = 0

Reorder the terms:
28 + -17x + 2x2 = 0

Solving
28 + -17x + 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'.
14 + -8.5x + x2 = 0

Move the constant term to the right:

Add '-14' to each side of the equation.
14 + -8.5x + -14 + x2 = 0 + -14

Reorder the terms:
14 + -14 + -8.5x + x2 = 0 + -14

Combine like terms: 14 + -14 = 0
0 + -8.5x + x2 = 0 + -14
-8.5x + x2 = 0 + -14

Combine like terms: 0 + -14 = -14
-8.5x + x2 = -14

The x term is -8.5x.  Take half its coefficient (-4.25).
Square it (18.0625) and add it to both sides.

Add '18.0625' to each side of the equation.
-8.5x + 18.0625 + x2 = -14 + 18.0625

Reorder the terms:
18.0625 + -8.5x + x2 = -14 + 18.0625

Combine like terms: -14 + 18.0625 = 4.0625
18.0625 + -8.5x + x2 = 4.0625

Factor a perfect square on the left side:
(x + -4.25)(x + -4.25) = 4.0625

Calculate the square root of the right side: 2.015564437

Break this problem into two subproblems by setting 
(x + -4.25) equal to 2.015564437 and -2.015564437.

Subproblem 1

x + -4.25 = 2.015564437 Simplifying x + -4.25 = 2.015564437 Reorder the terms: -4.25 + x = 2.015564437 Solving -4.25 + x = 2.015564437 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.25' to each side of the equation. -4.25 + 4.25 + x = 2.015564437 + 4.25 Combine like terms: -4.25 + 4.25 = 0.00 0.00 + x = 2.015564437 + 4.25 x = 2.015564437 + 4.25 Combine like terms: 2.015564437 + 4.25 = 6.265564437 x = 6.265564437 Simplifying x = 6.265564437

Subproblem 2

x + -4.25 = -2.015564437 Simplifying x + -4.25 = -2.015564437 Reorder the terms: -4.25 + x = -2.015564437 Solving -4.25 + x = -2.015564437 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.25' to each side of the equation. -4.25 + 4.25 + x = -2.015564437 + 4.25 Combine like terms: -4.25 + 4.25 = 0.00 0.00 + x = -2.015564437 + 4.25 x = -2.015564437 + 4.25 Combine like terms: -2.015564437 + 4.25 = 2.234435563 x = 2.234435563 Simplifying x = 2.234435563

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.265564437, 2.234435563}

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