2y^2-210y+105=0

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Solution for 2y^2-210y+105=0 equation:


Simplifying
2y2 + -210y + 105 = 0

Reorder the terms:
105 + -210y + 2y2 = 0

Solving
105 + -210y + 2y2 = 0

Solving for variable 'y'.

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

Divide each side by '2'.
52.5 + -105y + y2 = 0

Move the constant term to the right:

Add '-52.5' to each side of the equation.
52.5 + -105y + -52.5 + y2 = 0 + -52.5

Reorder the terms:
52.5 + -52.5 + -105y + y2 = 0 + -52.5

Combine like terms: 52.5 + -52.5 = 0.0
0.0 + -105y + y2 = 0 + -52.5
-105y + y2 = 0 + -52.5

Combine like terms: 0 + -52.5 = -52.5
-105y + y2 = -52.5

The y term is -105y.  Take half its coefficient (-52.5).
Square it (2756.25) and add it to both sides.

Add '2756.25' to each side of the equation.
-105y + 2756.25 + y2 = -52.5 + 2756.25

Reorder the terms:
2756.25 + -105y + y2 = -52.5 + 2756.25

Combine like terms: -52.5 + 2756.25 = 2703.75
2756.25 + -105y + y2 = 2703.75

Factor a perfect square on the left side:
(y + -52.5)(y + -52.5) = 2703.75

Calculate the square root of the right side: 51.997596098

Break this problem into two subproblems by setting 
(y + -52.5) equal to 51.997596098 and -51.997596098.

Subproblem 1

y + -52.5 = 51.997596098 Simplifying y + -52.5 = 51.997596098 Reorder the terms: -52.5 + y = 51.997596098 Solving -52.5 + y = 51.997596098 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '52.5' to each side of the equation. -52.5 + 52.5 + y = 51.997596098 + 52.5 Combine like terms: -52.5 + 52.5 = 0.0 0.0 + y = 51.997596098 + 52.5 y = 51.997596098 + 52.5 Combine like terms: 51.997596098 + 52.5 = 104.497596098 y = 104.497596098 Simplifying y = 104.497596098

Subproblem 2

y + -52.5 = -51.997596098 Simplifying y + -52.5 = -51.997596098 Reorder the terms: -52.5 + y = -51.997596098 Solving -52.5 + y = -51.997596098 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '52.5' to each side of the equation. -52.5 + 52.5 + y = -51.997596098 + 52.5 Combine like terms: -52.5 + 52.5 = 0.0 0.0 + y = -51.997596098 + 52.5 y = -51.997596098 + 52.5 Combine like terms: -51.997596098 + 52.5 = 0.502403902 y = 0.502403902 Simplifying y = 0.502403902

Solution

The solution to the problem is based on the solutions from the subproblems. y = {104.497596098, 0.502403902}

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