5X^2+8X+1=0

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Solution for 5X^2+8X+1=0 equation:


Simplifying
5X2 + 8X + 1 = 0

Reorder the terms:
1 + 8X + 5X2 = 0

Solving
1 + 8X + 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'.
0.2 + 1.6X + X2 = 0

Move the constant term to the right:

Add '-0.2' to each side of the equation.
0.2 + 1.6X + -0.2 + X2 = 0 + -0.2

Reorder the terms:
0.2 + -0.2 + 1.6X + X2 = 0 + -0.2

Combine like terms: 0.2 + -0.2 = 0.0
0.0 + 1.6X + X2 = 0 + -0.2
1.6X + X2 = 0 + -0.2

Combine like terms: 0 + -0.2 = -0.2
1.6X + X2 = -0.2

The X term is 1.6X.  Take half its coefficient (0.8).
Square it (0.64) and add it to both sides.

Add '0.64' to each side of the equation.
1.6X + 0.64 + X2 = -0.2 + 0.64

Reorder the terms:
0.64 + 1.6X + X2 = -0.2 + 0.64

Combine like terms: -0.2 + 0.64 = 0.44
0.64 + 1.6X + X2 = 0.44

Factor a perfect square on the left side:
(X + 0.8)(X + 0.8) = 0.44

Calculate the square root of the right side: 0.663324958

Break this problem into two subproblems by setting 
(X + 0.8) equal to 0.663324958 and -0.663324958.

Subproblem 1

X + 0.8 = 0.663324958 Simplifying X + 0.8 = 0.663324958 Reorder the terms: 0.8 + X = 0.663324958 Solving 0.8 + X = 0.663324958 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-0.8' to each side of the equation. 0.8 + -0.8 + X = 0.663324958 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + X = 0.663324958 + -0.8 X = 0.663324958 + -0.8 Combine like terms: 0.663324958 + -0.8 = -0.136675042 X = -0.136675042 Simplifying X = -0.136675042

Subproblem 2

X + 0.8 = -0.663324958 Simplifying X + 0.8 = -0.663324958 Reorder the terms: 0.8 + X = -0.663324958 Solving 0.8 + X = -0.663324958 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-0.8' to each side of the equation. 0.8 + -0.8 + X = -0.663324958 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + X = -0.663324958 + -0.8 X = -0.663324958 + -0.8 Combine like terms: -0.663324958 + -0.8 = -1.463324958 X = -1.463324958 Simplifying X = -1.463324958

Solution

The solution to the problem is based on the solutions from the subproblems. X = {-0.136675042, -1.463324958}

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