x^2-41x-90=0

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Solution for x^2-41x-90=0 equation:


Simplifying
x2 + -41x + -90 = 0

Reorder the terms:
-90 + -41x + x2 = 0

Solving
-90 + -41x + 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 + -41x + 90 + x2 = 0 + 90

Reorder the terms:
-90 + 90 + -41x + x2 = 0 + 90

Combine like terms: -90 + 90 = 0
0 + -41x + x2 = 0 + 90
-41x + x2 = 0 + 90

Combine like terms: 0 + 90 = 90
-41x + x2 = 90

The x term is -41x.  Take half its coefficient (-20.5).
Square it (420.25) and add it to both sides.

Add '420.25' to each side of the equation.
-41x + 420.25 + x2 = 90 + 420.25

Reorder the terms:
420.25 + -41x + x2 = 90 + 420.25

Combine like terms: 90 + 420.25 = 510.25
420.25 + -41x + x2 = 510.25

Factor a perfect square on the left side:
(x + -20.5)(x + -20.5) = 510.25

Calculate the square root of the right side: 22.588713996

Break this problem into two subproblems by setting 
(x + -20.5) equal to 22.588713996 and -22.588713996.

Subproblem 1

x + -20.5 = 22.588713996 Simplifying x + -20.5 = 22.588713996 Reorder the terms: -20.5 + x = 22.588713996 Solving -20.5 + x = 22.588713996 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '20.5' to each side of the equation. -20.5 + 20.5 + x = 22.588713996 + 20.5 Combine like terms: -20.5 + 20.5 = 0.0 0.0 + x = 22.588713996 + 20.5 x = 22.588713996 + 20.5 Combine like terms: 22.588713996 + 20.5 = 43.088713996 x = 43.088713996 Simplifying x = 43.088713996

Subproblem 2

x + -20.5 = -22.588713996 Simplifying x + -20.5 = -22.588713996 Reorder the terms: -20.5 + x = -22.588713996 Solving -20.5 + x = -22.588713996 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '20.5' to each side of the equation. -20.5 + 20.5 + x = -22.588713996 + 20.5 Combine like terms: -20.5 + 20.5 = 0.0 0.0 + x = -22.588713996 + 20.5 x = -22.588713996 + 20.5 Combine like terms: -22.588713996 + 20.5 = -2.088713996 x = -2.088713996 Simplifying x = -2.088713996

Solution

The solution to the problem is based on the solutions from the subproblems. x = {43.088713996, -2.088713996}

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