x^2-90x-1800=0

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Solution for x^2-90x-1800=0 equation:


Simplifying
x2 + -90x + -1800 = 0

Reorder the terms:
-1800 + -90x + x2 = 0

Solving
-1800 + -90x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '1800' to each side of the equation.
-1800 + -90x + 1800 + x2 = 0 + 1800

Reorder the terms:
-1800 + 1800 + -90x + x2 = 0 + 1800

Combine like terms: -1800 + 1800 = 0
0 + -90x + x2 = 0 + 1800
-90x + x2 = 0 + 1800

Combine like terms: 0 + 1800 = 1800
-90x + x2 = 1800

The x term is -90x.  Take half its coefficient (-45).
Square it (2025) and add it to both sides.

Add '2025' to each side of the equation.
-90x + 2025 + x2 = 1800 + 2025

Reorder the terms:
2025 + -90x + x2 = 1800 + 2025

Combine like terms: 1800 + 2025 = 3825
2025 + -90x + x2 = 3825

Factor a perfect square on the left side:
(x + -45)(x + -45) = 3825

Calculate the square root of the right side: 61.846584384

Break this problem into two subproblems by setting 
(x + -45) equal to 61.846584384 and -61.846584384.

Subproblem 1

x + -45 = 61.846584384 Simplifying x + -45 = 61.846584384 Reorder the terms: -45 + x = 61.846584384 Solving -45 + x = 61.846584384 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '45' to each side of the equation. -45 + 45 + x = 61.846584384 + 45 Combine like terms: -45 + 45 = 0 0 + x = 61.846584384 + 45 x = 61.846584384 + 45 Combine like terms: 61.846584384 + 45 = 106.846584384 x = 106.846584384 Simplifying x = 106.846584384

Subproblem 2

x + -45 = -61.846584384 Simplifying x + -45 = -61.846584384 Reorder the terms: -45 + x = -61.846584384 Solving -45 + x = -61.846584384 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '45' to each side of the equation. -45 + 45 + x = -61.846584384 + 45 Combine like terms: -45 + 45 = 0 0 + x = -61.846584384 + 45 x = -61.846584384 + 45 Combine like terms: -61.846584384 + 45 = -16.846584384 x = -16.846584384 Simplifying x = -16.846584384

Solution

The solution to the problem is based on the solutions from the subproblems. x = {106.846584384, -16.846584384}

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