x^2-90x+90=0

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


Simplifying
x2 + -90x + 90 = 0

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

Solving
90 + -90x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

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

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

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

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

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 = -90 + 2025

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

Combine like terms: -90 + 2025 = 1935
2025 + -90x + x2 = 1935

Factor a perfect square on the left side:
(x + -45)(x + -45) = 1935

Calculate the square root of the right side: 43.988634896

Break this problem into two subproblems by setting 
(x + -45) equal to 43.988634896 and -43.988634896.

Subproblem 1

x + -45 = 43.988634896 Simplifying x + -45 = 43.988634896 Reorder the terms: -45 + x = 43.988634896 Solving -45 + x = 43.988634896 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 = 43.988634896 + 45 Combine like terms: -45 + 45 = 0 0 + x = 43.988634896 + 45 x = 43.988634896 + 45 Combine like terms: 43.988634896 + 45 = 88.988634896 x = 88.988634896 Simplifying x = 88.988634896

Subproblem 2

x + -45 = -43.988634896 Simplifying x + -45 = -43.988634896 Reorder the terms: -45 + x = -43.988634896 Solving -45 + x = -43.988634896 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 = -43.988634896 + 45 Combine like terms: -45 + 45 = 0 0 + x = -43.988634896 + 45 x = -43.988634896 + 45 Combine like terms: -43.988634896 + 45 = 1.011365104 x = 1.011365104 Simplifying x = 1.011365104

Solution

The solution to the problem is based on the solutions from the subproblems. x = {88.988634896, 1.011365104}

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