x^2-3x-36=2

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


Simplifying
x2 + -3x + -36 = 2

Reorder the terms:
-36 + -3x + x2 = 2

Solving
-36 + -3x + x2 = 2

Solving for variable 'x'.

Reorder the terms:
-36 + -2 + -3x + x2 = 2 + -2

Combine like terms: -36 + -2 = -38
-38 + -3x + x2 = 2 + -2

Combine like terms: 2 + -2 = 0
-38 + -3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '38' to each side of the equation.
-38 + -3x + 38 + x2 = 0 + 38

Reorder the terms:
-38 + 38 + -3x + x2 = 0 + 38

Combine like terms: -38 + 38 = 0
0 + -3x + x2 = 0 + 38
-3x + x2 = 0 + 38

Combine like terms: 0 + 38 = 38
-3x + x2 = 38

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 = 38 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 38 + 2.25

Combine like terms: 38 + 2.25 = 40.25
2.25 + -3x + x2 = 40.25

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 40.25

Calculate the square root of the right side: 6.34428877

Break this problem into two subproblems by setting 
(x + -1.5) equal to 6.34428877 and -6.34428877.

Subproblem 1

x + -1.5 = 6.34428877 Simplifying x + -1.5 = 6.34428877 Reorder the terms: -1.5 + x = 6.34428877 Solving -1.5 + x = 6.34428877 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 = 6.34428877 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 6.34428877 + 1.5 x = 6.34428877 + 1.5 Combine like terms: 6.34428877 + 1.5 = 7.84428877 x = 7.84428877 Simplifying x = 7.84428877

Subproblem 2

x + -1.5 = -6.34428877 Simplifying x + -1.5 = -6.34428877 Reorder the terms: -1.5 + x = -6.34428877 Solving -1.5 + x = -6.34428877 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 = -6.34428877 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -6.34428877 + 1.5 x = -6.34428877 + 1.5 Combine like terms: -6.34428877 + 1.5 = -4.84428877 x = -4.84428877 Simplifying x = -4.84428877

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.84428877, -4.84428877}

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