2x^2-17x-7=0

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Solution for 2x^2-17x-7=0 equation:


Simplifying
2x2 + -17x + -7 = 0

Reorder the terms:
-7 + -17x + 2x2 = 0

Solving
-7 + -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'.
-3.5 + -8.5x + x2 = 0

Move the constant term to the right:

Add '3.5' to each side of the equation.
-3.5 + -8.5x + 3.5 + x2 = 0 + 3.5

Reorder the terms:
-3.5 + 3.5 + -8.5x + x2 = 0 + 3.5

Combine like terms: -3.5 + 3.5 = 0.0
0.0 + -8.5x + x2 = 0 + 3.5
-8.5x + x2 = 0 + 3.5

Combine like terms: 0 + 3.5 = 3.5
-8.5x + x2 = 3.5

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 = 3.5 + 18.0625

Reorder the terms:
18.0625 + -8.5x + x2 = 3.5 + 18.0625

Combine like terms: 3.5 + 18.0625 = 21.5625
18.0625 + -8.5x + x2 = 21.5625

Factor a perfect square on the left side:
(x + -4.25)(x + -4.25) = 21.5625

Calculate the square root of the right side: 4.643543905

Break this problem into two subproblems by setting 
(x + -4.25) equal to 4.643543905 and -4.643543905.

Subproblem 1

x + -4.25 = 4.643543905 Simplifying x + -4.25 = 4.643543905 Reorder the terms: -4.25 + x = 4.643543905 Solving -4.25 + x = 4.643543905 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 = 4.643543905 + 4.25 Combine like terms: -4.25 + 4.25 = 0.00 0.00 + x = 4.643543905 + 4.25 x = 4.643543905 + 4.25 Combine like terms: 4.643543905 + 4.25 = 8.893543905 x = 8.893543905 Simplifying x = 8.893543905

Subproblem 2

x + -4.25 = -4.643543905 Simplifying x + -4.25 = -4.643543905 Reorder the terms: -4.25 + x = -4.643543905 Solving -4.25 + x = -4.643543905 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 = -4.643543905 + 4.25 Combine like terms: -4.25 + 4.25 = 0.00 0.00 + x = -4.643543905 + 4.25 x = -4.643543905 + 4.25 Combine like terms: -4.643543905 + 4.25 = -0.393543905 x = -0.393543905 Simplifying x = -0.393543905

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.893543905, -0.393543905}

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