x^2-19x-45=0

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Solution for x^2-19x-45=0 equation:


Simplifying
x2 + -19x + -45 = 0

Reorder the terms:
-45 + -19x + x2 = 0

Solving
-45 + -19x + 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 + -19x + 45 + x2 = 0 + 45

Reorder the terms:
-45 + 45 + -19x + x2 = 0 + 45

Combine like terms: -45 + 45 = 0
0 + -19x + x2 = 0 + 45
-19x + x2 = 0 + 45

Combine like terms: 0 + 45 = 45
-19x + x2 = 45

The x term is -19x.  Take half its coefficient (-9.5).
Square it (90.25) and add it to both sides.

Add '90.25' to each side of the equation.
-19x + 90.25 + x2 = 45 + 90.25

Reorder the terms:
90.25 + -19x + x2 = 45 + 90.25

Combine like terms: 45 + 90.25 = 135.25
90.25 + -19x + x2 = 135.25

Factor a perfect square on the left side:
(x + -9.5)(x + -9.5) = 135.25

Calculate the square root of the right side: 11.62970335

Break this problem into two subproblems by setting 
(x + -9.5) equal to 11.62970335 and -11.62970335.

Subproblem 1

x + -9.5 = 11.62970335 Simplifying x + -9.5 = 11.62970335 Reorder the terms: -9.5 + x = 11.62970335 Solving -9.5 + x = 11.62970335 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9.5' to each side of the equation. -9.5 + 9.5 + x = 11.62970335 + 9.5 Combine like terms: -9.5 + 9.5 = 0.0 0.0 + x = 11.62970335 + 9.5 x = 11.62970335 + 9.5 Combine like terms: 11.62970335 + 9.5 = 21.12970335 x = 21.12970335 Simplifying x = 21.12970335

Subproblem 2

x + -9.5 = -11.62970335 Simplifying x + -9.5 = -11.62970335 Reorder the terms: -9.5 + x = -11.62970335 Solving -9.5 + x = -11.62970335 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9.5' to each side of the equation. -9.5 + 9.5 + x = -11.62970335 + 9.5 Combine like terms: -9.5 + 9.5 = 0.0 0.0 + x = -11.62970335 + 9.5 x = -11.62970335 + 9.5 Combine like terms: -11.62970335 + 9.5 = -2.12970335 x = -2.12970335 Simplifying x = -2.12970335

Solution

The solution to the problem is based on the solutions from the subproblems. x = {21.12970335, -2.12970335}

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