x^2+17x+8=-3

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Solution for x^2+17x+8=-3 equation:


Simplifying
x2 + 17x + 8 = -3

Reorder the terms:
8 + 17x + x2 = -3

Solving
8 + 17x + x2 = -3

Solving for variable 'x'.

Reorder the terms:
8 + 3 + 17x + x2 = -3 + 3

Combine like terms: 8 + 3 = 11
11 + 17x + x2 = -3 + 3

Combine like terms: -3 + 3 = 0
11 + 17x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-11' to each side of the equation.
11 + 17x + -11 + x2 = 0 + -11

Reorder the terms:
11 + -11 + 17x + x2 = 0 + -11

Combine like terms: 11 + -11 = 0
0 + 17x + x2 = 0 + -11
17x + x2 = 0 + -11

Combine like terms: 0 + -11 = -11
17x + x2 = -11

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 = -11 + 72.25

Reorder the terms:
72.25 + 17x + x2 = -11 + 72.25

Combine like terms: -11 + 72.25 = 61.25
72.25 + 17x + x2 = 61.25

Factor a perfect square on the left side:
(x + 8.5)(x + 8.5) = 61.25

Calculate the square root of the right side: 7.826237921

Break this problem into two subproblems by setting 
(x + 8.5) equal to 7.826237921 and -7.826237921.

Subproblem 1

x + 8.5 = 7.826237921 Simplifying x + 8.5 = 7.826237921 Reorder the terms: 8.5 + x = 7.826237921 Solving 8.5 + x = 7.826237921 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 = 7.826237921 + -8.5 Combine like terms: 8.5 + -8.5 = 0.0 0.0 + x = 7.826237921 + -8.5 x = 7.826237921 + -8.5 Combine like terms: 7.826237921 + -8.5 = -0.673762079 x = -0.673762079 Simplifying x = -0.673762079

Subproblem 2

x + 8.5 = -7.826237921 Simplifying x + 8.5 = -7.826237921 Reorder the terms: 8.5 + x = -7.826237921 Solving 8.5 + x = -7.826237921 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 = -7.826237921 + -8.5 Combine like terms: 8.5 + -8.5 = 0.0 0.0 + x = -7.826237921 + -8.5 x = -7.826237921 + -8.5 Combine like terms: -7.826237921 + -8.5 = -16.326237921 x = -16.326237921 Simplifying x = -16.326237921

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.673762079, -16.326237921}

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