x^2=8x+11

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


Simplifying
x2 = 8x + 11

Reorder the terms:
x2 = 11 + 8x

Solving
x2 = 11 + 8x

Solving for variable 'x'.

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

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

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

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

Begin completing the square.

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 = 9.196152423 x = 9.196152423 Simplifying x = 9.196152423

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 = -1.196152423 x = -1.196152423 Simplifying x = -1.196152423

Solution

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

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