0=1+15x-15x^2

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Solution for 0=1+15x-15x^2 equation:


Simplifying
0 = 1 + 15x + -15x2

Solving
0 = 1 + 15x + -15x2

Solving for variable 'x'.

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

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

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

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

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

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

Divide each side by '15'.
-0.06666666667 + -1x + x2 = 0

Move the constant term to the right:

Add '0.06666666667' to each side of the equation.
-0.06666666667 + -1x + 0.06666666667 + x2 = 0 + 0.06666666667

Reorder the terms:
-0.06666666667 + 0.06666666667 + -1x + x2 = 0 + 0.06666666667

Combine like terms: -0.06666666667 + 0.06666666667 = 0.00000000000
0.00000000000 + -1x + x2 = 0 + 0.06666666667
-1x + x2 = 0 + 0.06666666667

Combine like terms: 0 + 0.06666666667 = 0.06666666667
-1x + x2 = 0.06666666667

The x term is -1x.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1x + 0.25 + x2 = 0.06666666667 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 0.06666666667 + 0.25

Combine like terms: 0.06666666667 + 0.25 = 0.31666666667
0.25 + -1x + x2 = 0.31666666667

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 0.31666666667

Calculate the square root of the right side: 0.562731434

Break this problem into two subproblems by setting 
(x + -0.5) equal to 0.562731434 and -0.562731434.

Subproblem 1

x + -0.5 = 0.562731434 Simplifying x + -0.5 = 0.562731434 Reorder the terms: -0.5 + x = 0.562731434 Solving -0.5 + x = 0.562731434 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = 0.562731434 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 0.562731434 + 0.5 x = 0.562731434 + 0.5 Combine like terms: 0.562731434 + 0.5 = 1.062731434 x = 1.062731434 Simplifying x = 1.062731434

Subproblem 2

x + -0.5 = -0.562731434 Simplifying x + -0.5 = -0.562731434 Reorder the terms: -0.5 + x = -0.562731434 Solving -0.5 + x = -0.562731434 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = -0.562731434 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -0.562731434 + 0.5 x = -0.562731434 + 0.5 Combine like terms: -0.562731434 + 0.5 = -0.062731434 x = -0.062731434 Simplifying x = -0.062731434

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.062731434, -0.062731434}

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