11-x^2=8x

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Solution for 11-x^2=8x equation:


Simplifying
11 + -1x2 = 8x

Solving
11 + -1x2 = 8x

Solving for variable 'x'.

Reorder the terms:
11 + -8x + -1x2 = 8x + -8x

Combine like terms: 8x + -8x = 0
11 + -8x + -1x2 = 0

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

Divide each side by '-1'.
-11 + 8x + x2 = 0

Move the constant term to the right:

Add '11' to each side of the equation.
-11 + 8x + 11 + x2 = 0 + 11

Reorder the terms:
-11 + 11 + 8x + x2 = 0 + 11

Combine like terms: -11 + 11 = 0
0 + 8x + x2 = 0 + 11
8x + x2 = 0 + 11

Combine like terms: 0 + 11 = 11
8x + x2 = 11

The x term is 8x.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8x + 16 + x2 = 11 + 16

Reorder the terms:
16 + 8x + x2 = 11 + 16

Combine like terms: 11 + 16 = 27
16 + 8x + x2 = 27

Factor a perfect square on the left side:
(x + 4)(x + 4) = 27

Calculate the square root of the right side: 5.196152423

Break this problem into two subproblems by setting 
(x + 4) equal to 5.196152423 and -5.196152423.

Subproblem 1

x + 4 = 5.196152423 Simplifying x + 4 = 5.196152423 Reorder the terms: 4 + x = 5.196152423 Solving 4 + x = 5.196152423 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = 5.196152423 + -4 Combine like terms: 4 + -4 = 0 0 + x = 5.196152423 + -4 x = 5.196152423 + -4 Combine like terms: 5.196152423 + -4 = 1.196152423 x = 1.196152423 Simplifying x = 1.196152423

Subproblem 2

x + 4 = -5.196152423 Simplifying x + 4 = -5.196152423 Reorder the terms: 4 + x = -5.196152423 Solving 4 + x = -5.196152423 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = -5.196152423 + -4 Combine like terms: 4 + -4 = 0 0 + x = -5.196152423 + -4 x = -5.196152423 + -4 Combine like terms: -5.196152423 + -4 = -9.196152423 x = -9.196152423 Simplifying x = -9.196152423

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.196152423, -9.196152423}

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