5x^2+16x+8=0

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Solution for 5x^2+16x+8=0 equation:


Simplifying
5x2 + 16x + 8 = 0

Reorder the terms:
8 + 16x + 5x2 = 0

Solving
8 + 16x + 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 + 3.2x + x2 = 0

Move the constant term to the right:

Add '-1.6' to each side of the equation.
1.6 + 3.2x + -1.6 + x2 = 0 + -1.6

Reorder the terms:
1.6 + -1.6 + 3.2x + x2 = 0 + -1.6

Combine like terms: 1.6 + -1.6 = 0.0
0.0 + 3.2x + x2 = 0 + -1.6
3.2x + x2 = 0 + -1.6

Combine like terms: 0 + -1.6 = -1.6
3.2x + x2 = -1.6

The x term is 3.2x.  Take half its coefficient (1.6).
Square it (2.56) and add it to both sides.

Add '2.56' to each side of the equation.
3.2x + 2.56 + x2 = -1.6 + 2.56

Reorder the terms:
2.56 + 3.2x + x2 = -1.6 + 2.56

Combine like terms: -1.6 + 2.56 = 0.96
2.56 + 3.2x + x2 = 0.96

Factor a perfect square on the left side:
(x + 1.6)(x + 1.6) = 0.96

Calculate the square root of the right side: 0.979795897

Break this problem into two subproblems by setting 
(x + 1.6) equal to 0.979795897 and -0.979795897.

Subproblem 1

x + 1.6 = 0.979795897 Simplifying x + 1.6 = 0.979795897 Reorder the terms: 1.6 + x = 0.979795897 Solving 1.6 + x = 0.979795897 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.6' to each side of the equation. 1.6 + -1.6 + x = 0.979795897 + -1.6 Combine like terms: 1.6 + -1.6 = 0.0 0.0 + x = 0.979795897 + -1.6 x = 0.979795897 + -1.6 Combine like terms: 0.979795897 + -1.6 = -0.620204103 x = -0.620204103 Simplifying x = -0.620204103

Subproblem 2

x + 1.6 = -0.979795897 Simplifying x + 1.6 = -0.979795897 Reorder the terms: 1.6 + x = -0.979795897 Solving 1.6 + x = -0.979795897 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.6' to each side of the equation. 1.6 + -1.6 + x = -0.979795897 + -1.6 Combine like terms: 1.6 + -1.6 = 0.0 0.0 + x = -0.979795897 + -1.6 x = -0.979795897 + -1.6 Combine like terms: -0.979795897 + -1.6 = -2.579795897 x = -2.579795897 Simplifying x = -2.579795897

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.620204103, -2.579795897}

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