x^2-15x-33=0

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Solution for x^2-15x-33=0 equation:


Simplifying
x2 + -15x + -33 = 0

Reorder the terms:
-33 + -15x + x2 = 0

Solving
-33 + -15x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '33' to each side of the equation.
-33 + -15x + 33 + x2 = 0 + 33

Reorder the terms:
-33 + 33 + -15x + x2 = 0 + 33

Combine like terms: -33 + 33 = 0
0 + -15x + x2 = 0 + 33
-15x + x2 = 0 + 33

Combine like terms: 0 + 33 = 33
-15x + x2 = 33

The x term is -15x.  Take half its coefficient (-7.5).
Square it (56.25) and add it to both sides.

Add '56.25' to each side of the equation.
-15x + 56.25 + x2 = 33 + 56.25

Reorder the terms:
56.25 + -15x + x2 = 33 + 56.25

Combine like terms: 33 + 56.25 = 89.25
56.25 + -15x + x2 = 89.25

Factor a perfect square on the left side:
(x + -7.5)(x + -7.5) = 89.25

Calculate the square root of the right side: 9.447221814

Break this problem into two subproblems by setting 
(x + -7.5) equal to 9.447221814 and -9.447221814.

Subproblem 1

x + -7.5 = 9.447221814 Simplifying x + -7.5 = 9.447221814 Reorder the terms: -7.5 + x = 9.447221814 Solving -7.5 + x = 9.447221814 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.5' to each side of the equation. -7.5 + 7.5 + x = 9.447221814 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + x = 9.447221814 + 7.5 x = 9.447221814 + 7.5 Combine like terms: 9.447221814 + 7.5 = 16.947221814 x = 16.947221814 Simplifying x = 16.947221814

Subproblem 2

x + -7.5 = -9.447221814 Simplifying x + -7.5 = -9.447221814 Reorder the terms: -7.5 + x = -9.447221814 Solving -7.5 + x = -9.447221814 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.5' to each side of the equation. -7.5 + 7.5 + x = -9.447221814 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + x = -9.447221814 + 7.5 x = -9.447221814 + 7.5 Combine like terms: -9.447221814 + 7.5 = -1.947221814 x = -1.947221814 Simplifying x = -1.947221814

Solution

The solution to the problem is based on the solutions from the subproblems. x = {16.947221814, -1.947221814}

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