x^2-3x-162=0

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Solution for x^2-3x-162=0 equation:


Simplifying
x2 + -3x + -162 = 0

Reorder the terms:
-162 + -3x + x2 = 0

Solving
-162 + -3x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '162' to each side of the equation.
-162 + -3x + 162 + x2 = 0 + 162

Reorder the terms:
-162 + 162 + -3x + x2 = 0 + 162

Combine like terms: -162 + 162 = 0
0 + -3x + x2 = 0 + 162
-3x + x2 = 0 + 162

Combine like terms: 0 + 162 = 162
-3x + x2 = 162

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 = 162 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 162 + 2.25

Combine like terms: 162 + 2.25 = 164.25
2.25 + -3x + x2 = 164.25

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 164.25

Calculate the square root of the right side: 12.816005618

Break this problem into two subproblems by setting 
(x + -1.5) equal to 12.816005618 and -12.816005618.

Subproblem 1

x + -1.5 = 12.816005618 Simplifying x + -1.5 = 12.816005618 Reorder the terms: -1.5 + x = 12.816005618 Solving -1.5 + x = 12.816005618 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 = 12.816005618 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 12.816005618 + 1.5 x = 12.816005618 + 1.5 Combine like terms: 12.816005618 + 1.5 = 14.316005618 x = 14.316005618 Simplifying x = 14.316005618

Subproblem 2

x + -1.5 = -12.816005618 Simplifying x + -1.5 = -12.816005618 Reorder the terms: -1.5 + x = -12.816005618 Solving -1.5 + x = -12.816005618 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 = -12.816005618 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -12.816005618 + 1.5 x = -12.816005618 + 1.5 Combine like terms: -12.816005618 + 1.5 = -11.316005618 x = -11.316005618 Simplifying x = -11.316005618

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.316005618, -11.316005618}

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