0=x^2-15x+10

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Solution for 0=x^2-15x+10 equation:


Simplifying
0 = x2 + -15x + 10

Reorder the terms:
0 = 10 + -15x + x2

Solving
0 = 10 + -15x + x2

Solving for variable 'x'.

Combine like terms: 0 + -10 = -10
-10 + 15x + -1x2 = 10 + -15x + x2 + -10 + 15x + -1x2

Reorder the terms:
-10 + 15x + -1x2 = 10 + -10 + -15x + 15x + x2 + -1x2

Combine like terms: 10 + -10 = 0
-10 + 15x + -1x2 = 0 + -15x + 15x + x2 + -1x2
-10 + 15x + -1x2 = -15x + 15x + x2 + -1x2

Combine like terms: -15x + 15x = 0
-10 + 15x + -1x2 = 0 + x2 + -1x2
-10 + 15x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-10 + 15x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
10 + -15x + x2 = 0

Move the constant term to the right:

Add '-10' to each side of the equation.
10 + -15x + -10 + x2 = 0 + -10

Reorder the terms:
10 + -10 + -15x + x2 = 0 + -10

Combine like terms: 10 + -10 = 0
0 + -15x + x2 = 0 + -10
-15x + x2 = 0 + -10

Combine like terms: 0 + -10 = -10
-15x + x2 = -10

The x term is -15x.  Take half its coefficient (-7.5).
Square it (56.25) and add it to both sides.

Add '56.25' to each side of the equation.
-15x + 56.25 + x2 = -10 + 56.25

Reorder the terms:
56.25 + -15x + x2 = -10 + 56.25

Combine like terms: -10 + 56.25 = 46.25
56.25 + -15x + x2 = 46.25

Factor a perfect square on the left side:
(x + -7.5)(x + -7.5) = 46.25

Calculate the square root of the right side: 6.800735254

Break this problem into two subproblems by setting 
(x + -7.5) equal to 6.800735254 and -6.800735254.

Subproblem 1

x + -7.5 = 6.800735254 Simplifying x + -7.5 = 6.800735254 Reorder the terms: -7.5 + x = 6.800735254 Solving -7.5 + x = 6.800735254 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.5' to each side of the equation. -7.5 + 7.5 + x = 6.800735254 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + x = 6.800735254 + 7.5 x = 6.800735254 + 7.5 Combine like terms: 6.800735254 + 7.5 = 14.300735254 x = 14.300735254 Simplifying x = 14.300735254

Subproblem 2

x + -7.5 = -6.800735254 Simplifying x + -7.5 = -6.800735254 Reorder the terms: -7.5 + x = -6.800735254 Solving -7.5 + x = -6.800735254 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.5' to each side of the equation. -7.5 + 7.5 + x = -6.800735254 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + x = -6.800735254 + 7.5 x = -6.800735254 + 7.5 Combine like terms: -6.800735254 + 7.5 = 0.699264746 x = 0.699264746 Simplifying x = 0.699264746

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.300735254, 0.699264746}

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