x^2-28x=11

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Solution for x^2-28x=11 equation:


Simplifying
x2 + -28x = 11

Reorder the terms:
-28x + x2 = 11

Solving
-28x + x2 = 11

Solving for variable 'x'.

Reorder the terms:
-11 + -28x + x2 = 11 + -11

Combine like terms: 11 + -11 = 0
-11 + -28x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '11' to each side of the equation.
-11 + -28x + 11 + x2 = 0 + 11

Reorder the terms:
-11 + 11 + -28x + x2 = 0 + 11

Combine like terms: -11 + 11 = 0
0 + -28x + x2 = 0 + 11
-28x + x2 = 0 + 11

Combine like terms: 0 + 11 = 11
-28x + x2 = 11

The x term is -28x.  Take half its coefficient (-14).
Square it (196) and add it to both sides.

Add '196' to each side of the equation.
-28x + 196 + x2 = 11 + 196

Reorder the terms:
196 + -28x + x2 = 11 + 196

Combine like terms: 11 + 196 = 207
196 + -28x + x2 = 207

Factor a perfect square on the left side:
(x + -14)(x + -14) = 207

Calculate the square root of the right side: 14.38749457

Break this problem into two subproblems by setting 
(x + -14) equal to 14.38749457 and -14.38749457.

Subproblem 1

x + -14 = 14.38749457 Simplifying x + -14 = 14.38749457 Reorder the terms: -14 + x = 14.38749457 Solving -14 + x = 14.38749457 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + x = 14.38749457 + 14 Combine like terms: -14 + 14 = 0 0 + x = 14.38749457 + 14 x = 14.38749457 + 14 Combine like terms: 14.38749457 + 14 = 28.38749457 x = 28.38749457 Simplifying x = 28.38749457

Subproblem 2

x + -14 = -14.38749457 Simplifying x + -14 = -14.38749457 Reorder the terms: -14 + x = -14.38749457 Solving -14 + x = -14.38749457 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + x = -14.38749457 + 14 Combine like terms: -14 + 14 = 0 0 + x = -14.38749457 + 14 x = -14.38749457 + 14 Combine like terms: -14.38749457 + 14 = -0.38749457 x = -0.38749457 Simplifying x = -0.38749457

Solution

The solution to the problem is based on the solutions from the subproblems. x = {28.38749457, -0.38749457}

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