x^2+17x-336=0

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Solution for x^2+17x-336=0 equation:


Simplifying
x2 + 17x + -336 = 0

Reorder the terms:
-336 + 17x + x2 = 0

Solving
-336 + 17x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '336' to each side of the equation.
-336 + 17x + 336 + x2 = 0 + 336

Reorder the terms:
-336 + 336 + 17x + x2 = 0 + 336

Combine like terms: -336 + 336 = 0
0 + 17x + x2 = 0 + 336
17x + x2 = 0 + 336

Combine like terms: 0 + 336 = 336
17x + x2 = 336

The x term is 17x.  Take half its coefficient (8.5).
Square it (72.25) and add it to both sides.

Add '72.25' to each side of the equation.
17x + 72.25 + x2 = 336 + 72.25

Reorder the terms:
72.25 + 17x + x2 = 336 + 72.25

Combine like terms: 336 + 72.25 = 408.25
72.25 + 17x + x2 = 408.25

Factor a perfect square on the left side:
(x + 8.5)(x + 8.5) = 408.25

Calculate the square root of the right side: 20.205197351

Break this problem into two subproblems by setting 
(x + 8.5) equal to 20.205197351 and -20.205197351.

Subproblem 1

x + 8.5 = 20.205197351 Simplifying x + 8.5 = 20.205197351 Reorder the terms: 8.5 + x = 20.205197351 Solving 8.5 + x = 20.205197351 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8.5' to each side of the equation. 8.5 + -8.5 + x = 20.205197351 + -8.5 Combine like terms: 8.5 + -8.5 = 0.0 0.0 + x = 20.205197351 + -8.5 x = 20.205197351 + -8.5 Combine like terms: 20.205197351 + -8.5 = 11.705197351 x = 11.705197351 Simplifying x = 11.705197351

Subproblem 2

x + 8.5 = -20.205197351 Simplifying x + 8.5 = -20.205197351 Reorder the terms: 8.5 + x = -20.205197351 Solving 8.5 + x = -20.205197351 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8.5' to each side of the equation. 8.5 + -8.5 + x = -20.205197351 + -8.5 Combine like terms: 8.5 + -8.5 = 0.0 0.0 + x = -20.205197351 + -8.5 x = -20.205197351 + -8.5 Combine like terms: -20.205197351 + -8.5 = -28.705197351 x = -28.705197351 Simplifying x = -28.705197351

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.705197351, -28.705197351}

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