x^2+11x=50.75

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Solution for x^2+11x=50.75 equation:


Simplifying
x2 + 11x = 50.75

Reorder the terms:
11x + x2 = 50.75

Solving
11x + x2 = 50.75

Solving for variable 'x'.

Reorder the terms:
-50.75 + 11x + x2 = 50.75 + -50.75

Combine like terms: 50.75 + -50.75 = 0.00
-50.75 + 11x + x2 = 0.00

Begin completing the square.

Move the constant term to the right:

Add '50.75' to each side of the equation.
-50.75 + 11x + 50.75 + x2 = 0.00 + 50.75

Reorder the terms:
-50.75 + 50.75 + 11x + x2 = 0.00 + 50.75

Combine like terms: -50.75 + 50.75 = 0.00
0.00 + 11x + x2 = 0.00 + 50.75
11x + x2 = 0.00 + 50.75

Combine like terms: 0.00 + 50.75 = 50.75
11x + x2 = 50.75

The x term is 11x.  Take half its coefficient (5.5).
Square it (30.25) and add it to both sides.

Add '30.25' to each side of the equation.
11x + 30.25 + x2 = 50.75 + 30.25

Reorder the terms:
30.25 + 11x + x2 = 50.75 + 30.25

Combine like terms: 50.75 + 30.25 = 81
30.25 + 11x + x2 = 81

Factor a perfect square on the left side:
(x + 5.5)(x + 5.5) = 81

Calculate the square root of the right side: 9

Break this problem into two subproblems by setting 
(x + 5.5) equal to 9 and -9.

Subproblem 1

x + 5.5 = 9 Simplifying x + 5.5 = 9 Reorder the terms: 5.5 + x = 9 Solving 5.5 + x = 9 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.5' to each side of the equation. 5.5 + -5.5 + x = 9 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + x = 9 + -5.5 x = 9 + -5.5 Combine like terms: 9 + -5.5 = 3.5 x = 3.5 Simplifying x = 3.5

Subproblem 2

x + 5.5 = -9 Simplifying x + 5.5 = -9 Reorder the terms: 5.5 + x = -9 Solving 5.5 + x = -9 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.5' to each side of the equation. 5.5 + -5.5 + x = -9 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + x = -9 + -5.5 x = -9 + -5.5 Combine like terms: -9 + -5.5 = -14.5 x = -14.5 Simplifying x = -14.5

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.5, -14.5}

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