x^2+17x=56

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Solution for x^2+17x=56 equation:


Simplifying
x2 + 17x = 56

Reorder the terms:
17x + x2 = 56

Solving
17x + x2 = 56

Solving for variable 'x'.

Reorder the terms:
-56 + 17x + x2 = 56 + -56

Combine like terms: 56 + -56 = 0
-56 + 17x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '56' to each side of the equation.
-56 + 17x + 56 + x2 = 0 + 56

Reorder the terms:
-56 + 56 + 17x + x2 = 0 + 56

Combine like terms: -56 + 56 = 0
0 + 17x + x2 = 0 + 56
17x + x2 = 0 + 56

Combine like terms: 0 + 56 = 56
17x + x2 = 56

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 = 56 + 72.25

Reorder the terms:
72.25 + 17x + x2 = 56 + 72.25

Combine like terms: 56 + 72.25 = 128.25
72.25 + 17x + x2 = 128.25

Factor a perfect square on the left side:
(x + 8.5)(x + 8.5) = 128.25

Calculate the square root of the right side: 11.324751653

Break this problem into two subproblems by setting 
(x + 8.5) equal to 11.324751653 and -11.324751653.

Subproblem 1

x + 8.5 = 11.324751653 Simplifying x + 8.5 = 11.324751653 Reorder the terms: 8.5 + x = 11.324751653 Solving 8.5 + x = 11.324751653 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 = 11.324751653 + -8.5 Combine like terms: 8.5 + -8.5 = 0.0 0.0 + x = 11.324751653 + -8.5 x = 11.324751653 + -8.5 Combine like terms: 11.324751653 + -8.5 = 2.824751653 x = 2.824751653 Simplifying x = 2.824751653

Subproblem 2

x + 8.5 = -11.324751653 Simplifying x + 8.5 = -11.324751653 Reorder the terms: 8.5 + x = -11.324751653 Solving 8.5 + x = -11.324751653 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 = -11.324751653 + -8.5 Combine like terms: 8.5 + -8.5 = 0.0 0.0 + x = -11.324751653 + -8.5 x = -11.324751653 + -8.5 Combine like terms: -11.324751653 + -8.5 = -19.824751653 x = -19.824751653 Simplifying x = -19.824751653

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.824751653, -19.824751653}

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