8X^2-13X+3=0

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Solution for 8X^2-13X+3=0 equation:


Simplifying
8X2 + -13X + 3 = 0

Reorder the terms:
3 + -13X + 8X2 = 0

Solving
3 + -13X + 8X2 = 0

Solving for variable 'X'.

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

Divide each side by '8'.
0.375 + -1.625X + X2 = 0

Move the constant term to the right:

Add '-0.375' to each side of the equation.
0.375 + -1.625X + -0.375 + X2 = 0 + -0.375

Reorder the terms:
0.375 + -0.375 + -1.625X + X2 = 0 + -0.375

Combine like terms: 0.375 + -0.375 = 0.000
0.000 + -1.625X + X2 = 0 + -0.375
-1.625X + X2 = 0 + -0.375

Combine like terms: 0 + -0.375 = -0.375
-1.625X + X2 = -0.375

The X term is -1.625X.  Take half its coefficient (-0.8125).
Square it (0.66015625) and add it to both sides.

Add '0.66015625' to each side of the equation.
-1.625X + 0.66015625 + X2 = -0.375 + 0.66015625

Reorder the terms:
0.66015625 + -1.625X + X2 = -0.375 + 0.66015625

Combine like terms: -0.375 + 0.66015625 = 0.28515625
0.66015625 + -1.625X + X2 = 0.28515625

Factor a perfect square on the left side:
(X + -0.8125)(X + -0.8125) = 0.28515625

Calculate the square root of the right side: 0.534000234

Break this problem into two subproblems by setting 
(X + -0.8125) equal to 0.534000234 and -0.534000234.

Subproblem 1

X + -0.8125 = 0.534000234 Simplifying X + -0.8125 = 0.534000234 Reorder the terms: -0.8125 + X = 0.534000234 Solving -0.8125 + X = 0.534000234 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '0.8125' to each side of the equation. -0.8125 + 0.8125 + X = 0.534000234 + 0.8125 Combine like terms: -0.8125 + 0.8125 = 0.0000 0.0000 + X = 0.534000234 + 0.8125 X = 0.534000234 + 0.8125 Combine like terms: 0.534000234 + 0.8125 = 1.346500234 X = 1.346500234 Simplifying X = 1.346500234

Subproblem 2

X + -0.8125 = -0.534000234 Simplifying X + -0.8125 = -0.534000234 Reorder the terms: -0.8125 + X = -0.534000234 Solving -0.8125 + X = -0.534000234 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '0.8125' to each side of the equation. -0.8125 + 0.8125 + X = -0.534000234 + 0.8125 Combine like terms: -0.8125 + 0.8125 = 0.0000 0.0000 + X = -0.534000234 + 0.8125 X = -0.534000234 + 0.8125 Combine like terms: -0.534000234 + 0.8125 = 0.278499766 X = 0.278499766 Simplifying X = 0.278499766

Solution

The solution to the problem is based on the solutions from the subproblems. X = {1.346500234, 0.278499766}

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