15x-x^2-1=0

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


Simplifying
15x + -1x2 + -1 = 0

Reorder the terms:
-1 + 15x + -1x2 = 0

Solving
-1 + 15x + -1x2 = 0

Solving for variable 'x'.

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

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

Move the constant term to the right:

Add '-1' to each side of the equation.
1 + -15x + -1 + x2 = 0 + -1

Reorder the terms:
1 + -1 + -15x + x2 = 0 + -1

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

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

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 = -1 + 56.25

Reorder the terms:
56.25 + -15x + x2 = -1 + 56.25

Combine like terms: -1 + 56.25 = 55.25
56.25 + -15x + x2 = 55.25

Factor a perfect square on the left side:
(x + -7.5)(x + -7.5) = 55.25

Calculate the square root of the right side: 7.433034374

Break this problem into two subproblems by setting 
(x + -7.5) equal to 7.433034374 and -7.433034374.

Subproblem 1

x + -7.5 = 7.433034374 Simplifying x + -7.5 = 7.433034374 Reorder the terms: -7.5 + x = 7.433034374 Solving -7.5 + x = 7.433034374 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 = 7.433034374 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + x = 7.433034374 + 7.5 x = 7.433034374 + 7.5 Combine like terms: 7.433034374 + 7.5 = 14.933034374 x = 14.933034374 Simplifying x = 14.933034374

Subproblem 2

x + -7.5 = -7.433034374 Simplifying x + -7.5 = -7.433034374 Reorder the terms: -7.5 + x = -7.433034374 Solving -7.5 + x = -7.433034374 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 = -7.433034374 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + x = -7.433034374 + 7.5 x = -7.433034374 + 7.5 Combine like terms: -7.433034374 + 7.5 = 0.066965626 x = 0.066965626 Simplifying x = 0.066965626

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.933034374, 0.066965626}

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