0=y^2-10y-455

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Solution for 0=y^2-10y-455 equation:


Simplifying
0 = y2 + -10y + -455

Reorder the terms:
0 = -455 + -10y + y2

Solving
0 = -455 + -10y + y2

Solving for variable 'y'.

Combine like terms: 0 + 455 = 455
455 + 10y + -1y2 = -455 + -10y + y2 + 455 + 10y + -1y2

Reorder the terms:
455 + 10y + -1y2 = -455 + 455 + -10y + 10y + y2 + -1y2

Combine like terms: -455 + 455 = 0
455 + 10y + -1y2 = 0 + -10y + 10y + y2 + -1y2
455 + 10y + -1y2 = -10y + 10y + y2 + -1y2

Combine like terms: -10y + 10y = 0
455 + 10y + -1y2 = 0 + y2 + -1y2
455 + 10y + -1y2 = y2 + -1y2

Combine like terms: y2 + -1y2 = 0
455 + 10y + -1y2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-455 + -10y + y2 = 0

Move the constant term to the right:

Add '455' to each side of the equation.
-455 + -10y + 455 + y2 = 0 + 455

Reorder the terms:
-455 + 455 + -10y + y2 = 0 + 455

Combine like terms: -455 + 455 = 0
0 + -10y + y2 = 0 + 455
-10y + y2 = 0 + 455

Combine like terms: 0 + 455 = 455
-10y + y2 = 455

The y term is -10y.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10y + 25 + y2 = 455 + 25

Reorder the terms:
25 + -10y + y2 = 455 + 25

Combine like terms: 455 + 25 = 480
25 + -10y + y2 = 480

Factor a perfect square on the left side:
(y + -5)(y + -5) = 480

Calculate the square root of the right side: 21.9089023

Break this problem into two subproblems by setting 
(y + -5) equal to 21.9089023 and -21.9089023.

Subproblem 1

y + -5 = 21.9089023 Simplifying y + -5 = 21.9089023 Reorder the terms: -5 + y = 21.9089023 Solving -5 + y = 21.9089023 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + y = 21.9089023 + 5 Combine like terms: -5 + 5 = 0 0 + y = 21.9089023 + 5 y = 21.9089023 + 5 Combine like terms: 21.9089023 + 5 = 26.9089023 y = 26.9089023 Simplifying y = 26.9089023

Subproblem 2

y + -5 = -21.9089023 Simplifying y + -5 = -21.9089023 Reorder the terms: -5 + y = -21.9089023 Solving -5 + y = -21.9089023 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + y = -21.9089023 + 5 Combine like terms: -5 + 5 = 0 0 + y = -21.9089023 + 5 y = -21.9089023 + 5 Combine like terms: -21.9089023 + 5 = -16.9089023 y = -16.9089023 Simplifying y = -16.9089023

Solution

The solution to the problem is based on the solutions from the subproblems. y = {26.9089023, -16.9089023}

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