0=-5x-x^2+11

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Solution for 0=-5x-x^2+11 equation:


Simplifying
0 = -5x + -1x2 + 11

Reorder the terms:
0 = 11 + -5x + -1x2

Solving
0 = 11 + -5x + -1x2

Solving for variable 'x'.

Combine like terms: 0 + -11 = -11
-11 + 5x + x2 = 11 + -5x + -1x2 + -11 + 5x + x2

Reorder the terms:
-11 + 5x + x2 = 11 + -11 + -5x + 5x + -1x2 + x2

Combine like terms: 11 + -11 = 0
-11 + 5x + x2 = 0 + -5x + 5x + -1x2 + x2
-11 + 5x + x2 = -5x + 5x + -1x2 + x2

Combine like terms: -5x + 5x = 0
-11 + 5x + x2 = 0 + -1x2 + x2
-11 + 5x + x2 = -1x2 + x2

Combine like terms: -1x2 + x2 = 0
-11 + 5x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '11' to each side of the equation.
-11 + 5x + 11 + x2 = 0 + 11

Reorder the terms:
-11 + 11 + 5x + x2 = 0 + 11

Combine like terms: -11 + 11 = 0
0 + 5x + x2 = 0 + 11
5x + x2 = 0 + 11

Combine like terms: 0 + 11 = 11
5x + x2 = 11

The x term is 5x.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5x + 6.25 + x2 = 11 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 11 + 6.25

Combine like terms: 11 + 6.25 = 17.25
6.25 + 5x + x2 = 17.25

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 17.25

Calculate the square root of the right side: 4.153311931

Break this problem into two subproblems by setting 
(x + 2.5) equal to 4.153311931 and -4.153311931.

Subproblem 1

x + 2.5 = 4.153311931 Simplifying x + 2.5 = 4.153311931 Reorder the terms: 2.5 + x = 4.153311931 Solving 2.5 + x = 4.153311931 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = 4.153311931 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 4.153311931 + -2.5 x = 4.153311931 + -2.5 Combine like terms: 4.153311931 + -2.5 = 1.653311931 x = 1.653311931 Simplifying x = 1.653311931

Subproblem 2

x + 2.5 = -4.153311931 Simplifying x + 2.5 = -4.153311931 Reorder the terms: 2.5 + x = -4.153311931 Solving 2.5 + x = -4.153311931 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = -4.153311931 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -4.153311931 + -2.5 x = -4.153311931 + -2.5 Combine like terms: -4.153311931 + -2.5 = -6.653311931 x = -6.653311931 Simplifying x = -6.653311931

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.653311931, -6.653311931}

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