5X^2-15X+8=0

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Solution for 5X^2-15X+8=0 equation:


Simplifying
5X2 + -15X + 8 = 0

Reorder the terms:
8 + -15X + 5X2 = 0

Solving
8 + -15X + 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 + -3X + X2 = 0

Move the constant term to the right:

Add '-1.6' to each side of the equation.
1.6 + -3X + -1.6 + X2 = 0 + -1.6

Reorder the terms:
1.6 + -1.6 + -3X + X2 = 0 + -1.6

Combine like terms: 1.6 + -1.6 = 0.0
0.0 + -3X + X2 = 0 + -1.6
-3X + X2 = 0 + -1.6

Combine like terms: 0 + -1.6 = -1.6
-3X + X2 = -1.6

The X term is -3X.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3X + 2.25 + X2 = -1.6 + 2.25

Reorder the terms:
2.25 + -3X + X2 = -1.6 + 2.25

Combine like terms: -1.6 + 2.25 = 0.65
2.25 + -3X + X2 = 0.65

Factor a perfect square on the left side:
(X + -1.5)(X + -1.5) = 0.65

Calculate the square root of the right side: 0.806225775

Break this problem into two subproblems by setting 
(X + -1.5) equal to 0.806225775 and -0.806225775.

Subproblem 1

X + -1.5 = 0.806225775 Simplifying X + -1.5 = 0.806225775 Reorder the terms: -1.5 + X = 0.806225775 Solving -1.5 + X = 0.806225775 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + X = 0.806225775 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + X = 0.806225775 + 1.5 X = 0.806225775 + 1.5 Combine like terms: 0.806225775 + 1.5 = 2.306225775 X = 2.306225775 Simplifying X = 2.306225775

Subproblem 2

X + -1.5 = -0.806225775 Simplifying X + -1.5 = -0.806225775 Reorder the terms: -1.5 + X = -0.806225775 Solving -1.5 + X = -0.806225775 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + X = -0.806225775 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + X = -0.806225775 + 1.5 X = -0.806225775 + 1.5 Combine like terms: -0.806225775 + 1.5 = 0.693774225 X = 0.693774225 Simplifying X = 0.693774225

Solution

The solution to the problem is based on the solutions from the subproblems. X = {2.306225775, 0.693774225}

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