15-10x-x^2=0

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


Simplifying
15 + -10x + -1x2 = 0

Solving
15 + -10x + -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'.
-15 + 10x + x2 = 0

Move the constant term to the right:

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

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

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

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

The x term is 10x.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10x + 25 + x2 = 15 + 25

Reorder the terms:
25 + 10x + x2 = 15 + 25

Combine like terms: 15 + 25 = 40
25 + 10x + x2 = 40

Factor a perfect square on the left side:
(x + 5)(x + 5) = 40

Calculate the square root of the right side: 6.32455532

Break this problem into two subproblems by setting 
(x + 5) equal to 6.32455532 and -6.32455532.

Subproblem 1

x + 5 = 6.32455532 Simplifying x + 5 = 6.32455532 Reorder the terms: 5 + x = 6.32455532 Solving 5 + x = 6.32455532 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = 6.32455532 + -5 Combine like terms: 5 + -5 = 0 0 + x = 6.32455532 + -5 x = 6.32455532 + -5 Combine like terms: 6.32455532 + -5 = 1.32455532 x = 1.32455532 Simplifying x = 1.32455532

Subproblem 2

x + 5 = -6.32455532 Simplifying x + 5 = -6.32455532 Reorder the terms: 5 + x = -6.32455532 Solving 5 + x = -6.32455532 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = -6.32455532 + -5 Combine like terms: 5 + -5 = 0 0 + x = -6.32455532 + -5 x = -6.32455532 + -5 Combine like terms: -6.32455532 + -5 = -11.32455532 x = -11.32455532 Simplifying x = -11.32455532

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.32455532, -11.32455532}

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