x^2-4x-27=0

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Solution for x^2-4x-27=0 equation:


Simplifying
x2 + -4x + -27 = 0

Reorder the terms:
-27 + -4x + x2 = 0

Solving
-27 + -4x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '27' to each side of the equation.
-27 + -4x + 27 + x2 = 0 + 27

Reorder the terms:
-27 + 27 + -4x + x2 = 0 + 27

Combine like terms: -27 + 27 = 0
0 + -4x + x2 = 0 + 27
-4x + x2 = 0 + 27

Combine like terms: 0 + 27 = 27
-4x + x2 = 27

The x term is -4x.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x + 4 + x2 = 27 + 4

Reorder the terms:
4 + -4x + x2 = 27 + 4

Combine like terms: 27 + 4 = 31
4 + -4x + x2 = 31

Factor a perfect square on the left side:
(x + -2)(x + -2) = 31

Calculate the square root of the right side: 5.567764363

Break this problem into two subproblems by setting 
(x + -2) equal to 5.567764363 and -5.567764363.

Subproblem 1

x + -2 = 5.567764363 Simplifying x + -2 = 5.567764363 Reorder the terms: -2 + x = 5.567764363 Solving -2 + x = 5.567764363 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = 5.567764363 + 2 Combine like terms: -2 + 2 = 0 0 + x = 5.567764363 + 2 x = 5.567764363 + 2 Combine like terms: 5.567764363 + 2 = 7.567764363 x = 7.567764363 Simplifying x = 7.567764363

Subproblem 2

x + -2 = -5.567764363 Simplifying x + -2 = -5.567764363 Reorder the terms: -2 + x = -5.567764363 Solving -2 + x = -5.567764363 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = -5.567764363 + 2 Combine like terms: -2 + 2 = 0 0 + x = -5.567764363 + 2 x = -5.567764363 + 2 Combine like terms: -5.567764363 + 2 = -3.567764363 x = -3.567764363 Simplifying x = -3.567764363

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.567764363, -3.567764363}

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