x^2-90x+75=0

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Solution for x^2-90x+75=0 equation:


Simplifying
x2 + -90x + 75 = 0

Reorder the terms:
75 + -90x + x2 = 0

Solving
75 + -90x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-75' to each side of the equation.
75 + -90x + -75 + x2 = 0 + -75

Reorder the terms:
75 + -75 + -90x + x2 = 0 + -75

Combine like terms: 75 + -75 = 0
0 + -90x + x2 = 0 + -75
-90x + x2 = 0 + -75

Combine like terms: 0 + -75 = -75
-90x + x2 = -75

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 = -75 + 2025

Reorder the terms:
2025 + -90x + x2 = -75 + 2025

Combine like terms: -75 + 2025 = 1950
2025 + -90x + x2 = 1950

Factor a perfect square on the left side:
(x + -45)(x + -45) = 1950

Calculate the square root of the right side: 44.158804332

Break this problem into two subproblems by setting 
(x + -45) equal to 44.158804332 and -44.158804332.

Subproblem 1

x + -45 = 44.158804332 Simplifying x + -45 = 44.158804332 Reorder the terms: -45 + x = 44.158804332 Solving -45 + x = 44.158804332 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 = 44.158804332 + 45 Combine like terms: -45 + 45 = 0 0 + x = 44.158804332 + 45 x = 44.158804332 + 45 Combine like terms: 44.158804332 + 45 = 89.158804332 x = 89.158804332 Simplifying x = 89.158804332

Subproblem 2

x + -45 = -44.158804332 Simplifying x + -45 = -44.158804332 Reorder the terms: -45 + x = -44.158804332 Solving -45 + x = -44.158804332 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 = -44.158804332 + 45 Combine like terms: -45 + 45 = 0 0 + x = -44.158804332 + 45 x = -44.158804332 + 45 Combine like terms: -44.158804332 + 45 = 0.841195668 x = 0.841195668 Simplifying x = 0.841195668

Solution

The solution to the problem is based on the solutions from the subproblems. x = {89.158804332, 0.841195668}

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