x^2-6x-45=0

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Solution for x^2-6x-45=0 equation:


Simplifying
x2 + -6x + -45 = 0

Reorder the terms:
-45 + -6x + x2 = 0

Solving
-45 + -6x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '45' to each side of the equation.
-45 + -6x + 45 + x2 = 0 + 45

Reorder the terms:
-45 + 45 + -6x + x2 = 0 + 45

Combine like terms: -45 + 45 = 0
0 + -6x + x2 = 0 + 45
-6x + x2 = 0 + 45

Combine like terms: 0 + 45 = 45
-6x + x2 = 45

The x term is -6x.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6x + 9 + x2 = 45 + 9

Reorder the terms:
9 + -6x + x2 = 45 + 9

Combine like terms: 45 + 9 = 54
9 + -6x + x2 = 54

Factor a perfect square on the left side:
(x + -3)(x + -3) = 54

Calculate the square root of the right side: 7.348469228

Break this problem into two subproblems by setting 
(x + -3) equal to 7.348469228 and -7.348469228.

Subproblem 1

x + -3 = 7.348469228 Simplifying x + -3 = 7.348469228 Reorder the terms: -3 + x = 7.348469228 Solving -3 + x = 7.348469228 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = 7.348469228 + 3 Combine like terms: -3 + 3 = 0 0 + x = 7.348469228 + 3 x = 7.348469228 + 3 Combine like terms: 7.348469228 + 3 = 10.348469228 x = 10.348469228 Simplifying x = 10.348469228

Subproblem 2

x + -3 = -7.348469228 Simplifying x + -3 = -7.348469228 Reorder the terms: -3 + x = -7.348469228 Solving -3 + x = -7.348469228 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = -7.348469228 + 3 Combine like terms: -3 + 3 = 0 0 + x = -7.348469228 + 3 x = -7.348469228 + 3 Combine like terms: -7.348469228 + 3 = -4.348469228 x = -4.348469228 Simplifying x = -4.348469228

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.348469228, -4.348469228}

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