x^2+4.5x-1620=0

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Solution for x^2+4.5x-1620=0 equation:


Simplifying
x2 + 4.5x + -1620 = 0

Reorder the terms:
-1620 + 4.5x + x2 = 0

Solving
-1620 + 4.5x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '1620' to each side of the equation.
-1620 + 4.5x + 1620 + x2 = 0 + 1620

Reorder the terms:
-1620 + 1620 + 4.5x + x2 = 0 + 1620

Combine like terms: -1620 + 1620 = 0
0 + 4.5x + x2 = 0 + 1620
4.5x + x2 = 0 + 1620

Combine like terms: 0 + 1620 = 1620
4.5x + x2 = 1620

The x term is 4.5x.  Take half its coefficient (2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
4.5x + 5.0625 + x2 = 1620 + 5.0625

Reorder the terms:
5.0625 + 4.5x + x2 = 1620 + 5.0625

Combine like terms: 1620 + 5.0625 = 1625.0625
5.0625 + 4.5x + x2 = 1625.0625

Factor a perfect square on the left side:
(x + 2.25)(x + 2.25) = 1625.0625

Calculate the square root of the right side: 40.312063951

Break this problem into two subproblems by setting 
(x + 2.25) equal to 40.312063951 and -40.312063951.

Subproblem 1

x + 2.25 = 40.312063951 Simplifying x + 2.25 = 40.312063951 Reorder the terms: 2.25 + x = 40.312063951 Solving 2.25 + x = 40.312063951 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.25' to each side of the equation. 2.25 + -2.25 + x = 40.312063951 + -2.25 Combine like terms: 2.25 + -2.25 = 0.00 0.00 + x = 40.312063951 + -2.25 x = 40.312063951 + -2.25 Combine like terms: 40.312063951 + -2.25 = 38.062063951 x = 38.062063951 Simplifying x = 38.062063951

Subproblem 2

x + 2.25 = -40.312063951 Simplifying x + 2.25 = -40.312063951 Reorder the terms: 2.25 + x = -40.312063951 Solving 2.25 + x = -40.312063951 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.25' to each side of the equation. 2.25 + -2.25 + x = -40.312063951 + -2.25 Combine like terms: 2.25 + -2.25 = 0.00 0.00 + x = -40.312063951 + -2.25 x = -40.312063951 + -2.25 Combine like terms: -40.312063951 + -2.25 = -42.562063951 x = -42.562063951 Simplifying x = -42.562063951

Solution

The solution to the problem is based on the solutions from the subproblems. x = {38.062063951, -42.562063951}

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