2x^2-7x-17=0

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


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

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

Solving
-17 + -7x + 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'.
-8.5 + -3.5x + x2 = 0

Move the constant term to the right:

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

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

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

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

The x term is -3.5x.  Take half its coefficient (-1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
-3.5x + 3.0625 + x2 = 8.5 + 3.0625

Reorder the terms:
3.0625 + -3.5x + x2 = 8.5 + 3.0625

Combine like terms: 8.5 + 3.0625 = 11.5625
3.0625 + -3.5x + x2 = 11.5625

Factor a perfect square on the left side:
(x + -1.75)(x + -1.75) = 11.5625

Calculate the square root of the right side: 3.400367627

Break this problem into two subproblems by setting 
(x + -1.75) equal to 3.400367627 and -3.400367627.

Subproblem 1

x + -1.75 = 3.400367627 Simplifying x + -1.75 = 3.400367627 Reorder the terms: -1.75 + x = 3.400367627 Solving -1.75 + x = 3.400367627 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = 3.400367627 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = 3.400367627 + 1.75 x = 3.400367627 + 1.75 Combine like terms: 3.400367627 + 1.75 = 5.150367627 x = 5.150367627 Simplifying x = 5.150367627

Subproblem 2

x + -1.75 = -3.400367627 Simplifying x + -1.75 = -3.400367627 Reorder the terms: -1.75 + x = -3.400367627 Solving -1.75 + x = -3.400367627 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = -3.400367627 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = -3.400367627 + 1.75 x = -3.400367627 + 1.75 Combine like terms: -3.400367627 + 1.75 = -1.650367627 x = -1.650367627 Simplifying x = -1.650367627

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.150367627, -1.650367627}

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