5x^2+17x+8=0

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Solution for 5x^2+17x+8=0 equation:


Simplifying
5x2 + 17x + 8 = 0

Reorder the terms:
8 + 17x + 5x2 = 0

Solving
8 + 17x + 5x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
5 the coefficient of the squared term: 

Divide each side by '5'.
1.6 + 3.4x + x2 = 0

Move the constant term to the right:

Add '-1.6' to each side of the equation.
1.6 + 3.4x + -1.6 + x2 = 0 + -1.6

Reorder the terms:
1.6 + -1.6 + 3.4x + x2 = 0 + -1.6

Combine like terms: 1.6 + -1.6 = 0.0
0.0 + 3.4x + x2 = 0 + -1.6
3.4x + x2 = 0 + -1.6

Combine like terms: 0 + -1.6 = -1.6
3.4x + x2 = -1.6

The x term is 3.4x.  Take half its coefficient (1.7).
Square it (2.89) and add it to both sides.

Add '2.89' to each side of the equation.
3.4x + 2.89 + x2 = -1.6 + 2.89

Reorder the terms:
2.89 + 3.4x + x2 = -1.6 + 2.89

Combine like terms: -1.6 + 2.89 = 1.29
2.89 + 3.4x + x2 = 1.29

Factor a perfect square on the left side:
(x + 1.7)(x + 1.7) = 1.29

Calculate the square root of the right side: 1.135781669

Break this problem into two subproblems by setting 
(x + 1.7) equal to 1.135781669 and -1.135781669.

Subproblem 1

x + 1.7 = 1.135781669 Simplifying x + 1.7 = 1.135781669 Reorder the terms: 1.7 + x = 1.135781669 Solving 1.7 + x = 1.135781669 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.7' to each side of the equation. 1.7 + -1.7 + x = 1.135781669 + -1.7 Combine like terms: 1.7 + -1.7 = 0.0 0.0 + x = 1.135781669 + -1.7 x = 1.135781669 + -1.7 Combine like terms: 1.135781669 + -1.7 = -0.564218331 x = -0.564218331 Simplifying x = -0.564218331

Subproblem 2

x + 1.7 = -1.135781669 Simplifying x + 1.7 = -1.135781669 Reorder the terms: 1.7 + x = -1.135781669 Solving 1.7 + x = -1.135781669 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.7' to each side of the equation. 1.7 + -1.7 + x = -1.135781669 + -1.7 Combine like terms: 1.7 + -1.7 = 0.0 0.0 + x = -1.135781669 + -1.7 x = -1.135781669 + -1.7 Combine like terms: -1.135781669 + -1.7 = -2.835781669 x = -2.835781669 Simplifying x = -2.835781669

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.564218331, -2.835781669}

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