x^2-90x-3=0

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Solution for x^2-90x-3=0 equation:


Simplifying
x2 + -90x + -3 = 0

Reorder the terms:
-3 + -90x + x2 = 0

Solving
-3 + -90x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + -90x + 3 + x2 = 0 + 3

Reorder the terms:
-3 + 3 + -90x + x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -90x + x2 = 0 + 3
-90x + x2 = 0 + 3

Combine like terms: 0 + 3 = 3
-90x + x2 = 3

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 = 3 + 2025

Reorder the terms:
2025 + -90x + x2 = 3 + 2025

Combine like terms: 3 + 2025 = 2028
2025 + -90x + x2 = 2028

Factor a perfect square on the left side:
(x + -45)(x + -45) = 2028

Calculate the square root of the right side: 45.033320997

Break this problem into two subproblems by setting 
(x + -45) equal to 45.033320997 and -45.033320997.

Subproblem 1

x + -45 = 45.033320997 Simplifying x + -45 = 45.033320997 Reorder the terms: -45 + x = 45.033320997 Solving -45 + x = 45.033320997 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 = 45.033320997 + 45 Combine like terms: -45 + 45 = 0 0 + x = 45.033320997 + 45 x = 45.033320997 + 45 Combine like terms: 45.033320997 + 45 = 90.033320997 x = 90.033320997 Simplifying x = 90.033320997

Subproblem 2

x + -45 = -45.033320997 Simplifying x + -45 = -45.033320997 Reorder the terms: -45 + x = -45.033320997 Solving -45 + x = -45.033320997 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 = -45.033320997 + 45 Combine like terms: -45 + 45 = 0 0 + x = -45.033320997 + 45 x = -45.033320997 + 45 Combine like terms: -45.033320997 + 45 = -0.033320997 x = -0.033320997 Simplifying x = -0.033320997

Solution

The solution to the problem is based on the solutions from the subproblems. x = {90.033320997, -0.033320997}

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