x^2-3x-36=1

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Solution for x^2-3x-36=1 equation:


Simplifying
x2 + -3x + -36 = 1

Reorder the terms:
-36 + -3x + x2 = 1

Solving
-36 + -3x + x2 = 1

Solving for variable 'x'.

Reorder the terms:
-36 + -1 + -3x + x2 = 1 + -1

Combine like terms: -36 + -1 = -37
-37 + -3x + x2 = 1 + -1

Combine like terms: 1 + -1 = 0
-37 + -3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '37' to each side of the equation.
-37 + -3x + 37 + x2 = 0 + 37

Reorder the terms:
-37 + 37 + -3x + x2 = 0 + 37

Combine like terms: -37 + 37 = 0
0 + -3x + x2 = 0 + 37
-3x + x2 = 0 + 37

Combine like terms: 0 + 37 = 37
-3x + x2 = 37

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 37 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 37 + 2.25

Combine like terms: 37 + 2.25 = 39.25
2.25 + -3x + x2 = 39.25

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 39.25

Calculate the square root of the right side: 6.264982043

Break this problem into two subproblems by setting 
(x + -1.5) equal to 6.264982043 and -6.264982043.

Subproblem 1

x + -1.5 = 6.264982043 Simplifying x + -1.5 = 6.264982043 Reorder the terms: -1.5 + x = 6.264982043 Solving -1.5 + x = 6.264982043 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 6.264982043 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 6.264982043 + 1.5 x = 6.264982043 + 1.5 Combine like terms: 6.264982043 + 1.5 = 7.764982043 x = 7.764982043 Simplifying x = 7.764982043

Subproblem 2

x + -1.5 = -6.264982043 Simplifying x + -1.5 = -6.264982043 Reorder the terms: -1.5 + x = -6.264982043 Solving -1.5 + x = -6.264982043 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -6.264982043 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -6.264982043 + 1.5 x = -6.264982043 + 1.5 Combine like terms: -6.264982043 + 1.5 = -4.764982043 x = -4.764982043 Simplifying x = -4.764982043

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.764982043, -4.764982043}

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