x^2-90x=-180

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Solution for x^2-90x=-180 equation:


Simplifying
x2 + -90x = -180

Reorder the terms:
-90x + x2 = -180

Solving
-90x + x2 = -180

Solving for variable 'x'.

Reorder the terms:
180 + -90x + x2 = -180 + 180

Combine like terms: -180 + 180 = 0
180 + -90x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-180' to each side of the equation.
180 + -90x + -180 + x2 = 0 + -180

Reorder the terms:
180 + -180 + -90x + x2 = 0 + -180

Combine like terms: 180 + -180 = 0
0 + -90x + x2 = 0 + -180
-90x + x2 = 0 + -180

Combine like terms: 0 + -180 = -180
-90x + x2 = -180

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 = -180 + 2025

Reorder the terms:
2025 + -90x + x2 = -180 + 2025

Combine like terms: -180 + 2025 = 1845
2025 + -90x + x2 = 1845

Factor a perfect square on the left side:
(x + -45)(x + -45) = 1845

Calculate the square root of the right side: 42.95346319

Break this problem into two subproblems by setting 
(x + -45) equal to 42.95346319 and -42.95346319.

Subproblem 1

x + -45 = 42.95346319 Simplifying x + -45 = 42.95346319 Reorder the terms: -45 + x = 42.95346319 Solving -45 + x = 42.95346319 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 = 42.95346319 + 45 Combine like terms: -45 + 45 = 0 0 + x = 42.95346319 + 45 x = 42.95346319 + 45 Combine like terms: 42.95346319 + 45 = 87.95346319 x = 87.95346319 Simplifying x = 87.95346319

Subproblem 2

x + -45 = -42.95346319 Simplifying x + -45 = -42.95346319 Reorder the terms: -45 + x = -42.95346319 Solving -45 + x = -42.95346319 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 = -42.95346319 + 45 Combine like terms: -45 + 45 = 0 0 + x = -42.95346319 + 45 x = -42.95346319 + 45 Combine like terms: -42.95346319 + 45 = 2.04653681 x = 2.04653681 Simplifying x = 2.04653681

Solution

The solution to the problem is based on the solutions from the subproblems. x = {87.95346319, 2.04653681}

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