2y^2-20y+25=12

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Solution for 2y^2-20y+25=12 equation:


Simplifying
2y2 + -20y + 25 = 12

Reorder the terms:
25 + -20y + 2y2 = 12

Solving
25 + -20y + 2y2 = 12

Solving for variable 'y'.

Reorder the terms:
25 + -12 + -20y + 2y2 = 12 + -12

Combine like terms: 25 + -12 = 13
13 + -20y + 2y2 = 12 + -12

Combine like terms: 12 + -12 = 0
13 + -20y + 2y2 = 0

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

Divide each side by '2'.
6.5 + -10y + y2 = 0

Move the constant term to the right:

Add '-6.5' to each side of the equation.
6.5 + -10y + -6.5 + y2 = 0 + -6.5

Reorder the terms:
6.5 + -6.5 + -10y + y2 = 0 + -6.5

Combine like terms: 6.5 + -6.5 = 0.0
0.0 + -10y + y2 = 0 + -6.5
-10y + y2 = 0 + -6.5

Combine like terms: 0 + -6.5 = -6.5
-10y + y2 = -6.5

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 = -6.5 + 25

Reorder the terms:
25 + -10y + y2 = -6.5 + 25

Combine like terms: -6.5 + 25 = 18.5
25 + -10y + y2 = 18.5

Factor a perfect square on the left side:
(y + -5)(y + -5) = 18.5

Calculate the square root of the right side: 4.301162634

Break this problem into two subproblems by setting 
(y + -5) equal to 4.301162634 and -4.301162634.

Subproblem 1

y + -5 = 4.301162634 Simplifying y + -5 = 4.301162634 Reorder the terms: -5 + y = 4.301162634 Solving -5 + y = 4.301162634 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 = 4.301162634 + 5 Combine like terms: -5 + 5 = 0 0 + y = 4.301162634 + 5 y = 4.301162634 + 5 Combine like terms: 4.301162634 + 5 = 9.301162634 y = 9.301162634 Simplifying y = 9.301162634

Subproblem 2

y + -5 = -4.301162634 Simplifying y + -5 = -4.301162634 Reorder the terms: -5 + y = -4.301162634 Solving -5 + y = -4.301162634 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 = -4.301162634 + 5 Combine like terms: -5 + 5 = 0 0 + y = -4.301162634 + 5 y = -4.301162634 + 5 Combine like terms: -4.301162634 + 5 = 0.698837366 y = 0.698837366 Simplifying y = 0.698837366

Solution

The solution to the problem is based on the solutions from the subproblems. y = {9.301162634, 0.698837366}

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