2x^2+17x-74=0

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Solution for 2x^2+17x-74=0 equation:


Simplifying
2x2 + 17x + -74 = 0

Reorder the terms:
-74 + 17x + 2x2 = 0

Solving
-74 + 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'.
-37 + 8.5x + x2 = 0

Move the constant term to the right:

Add '37' to each side of the equation.
-37 + 8.5x + 37 + x2 = 0 + 37

Reorder the terms:
-37 + 37 + 8.5x + x2 = 0 + 37

Combine like terms: -37 + 37 = 0
0 + 8.5x + x2 = 0 + 37
8.5x + x2 = 0 + 37

Combine like terms: 0 + 37 = 37
8.5x + x2 = 37

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 = 37 + 18.0625

Reorder the terms:
18.0625 + 8.5x + x2 = 37 + 18.0625

Combine like terms: 37 + 18.0625 = 55.0625
18.0625 + 8.5x + x2 = 55.0625

Factor a perfect square on the left side:
(x + 4.25)(x + 4.25) = 55.0625

Calculate the square root of the right side: 7.42041104

Break this problem into two subproblems by setting 
(x + 4.25) equal to 7.42041104 and -7.42041104.

Subproblem 1

x + 4.25 = 7.42041104 Simplifying x + 4.25 = 7.42041104 Reorder the terms: 4.25 + x = 7.42041104 Solving 4.25 + x = 7.42041104 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 = 7.42041104 + -4.25 Combine like terms: 4.25 + -4.25 = 0.00 0.00 + x = 7.42041104 + -4.25 x = 7.42041104 + -4.25 Combine like terms: 7.42041104 + -4.25 = 3.17041104 x = 3.17041104 Simplifying x = 3.17041104

Subproblem 2

x + 4.25 = -7.42041104 Simplifying x + 4.25 = -7.42041104 Reorder the terms: 4.25 + x = -7.42041104 Solving 4.25 + x = -7.42041104 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 = -7.42041104 + -4.25 Combine like terms: 4.25 + -4.25 = 0.00 0.00 + x = -7.42041104 + -4.25 x = -7.42041104 + -4.25 Combine like terms: -7.42041104 + -4.25 = -11.67041104 x = -11.67041104 Simplifying x = -11.67041104

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.17041104, -11.67041104}

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