121=49+y^2-2*y+1

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Solution for 121=49+y^2-2*y+1 equation:


Simplifying
121 = 49 + y2 + -2y + 1

Reorder the terms:
121 = 49 + 1 + -2y + y2

Combine like terms: 49 + 1 = 50
121 = 50 + -2y + y2

Solving
121 = 50 + -2y + y2

Solving for variable 'y'.

Combine like terms: 121 + -50 = 71
71 + 2y + -1y2 = 50 + -2y + y2 + -50 + 2y + -1y2

Reorder the terms:
71 + 2y + -1y2 = 50 + -50 + -2y + 2y + y2 + -1y2

Combine like terms: 50 + -50 = 0
71 + 2y + -1y2 = 0 + -2y + 2y + y2 + -1y2
71 + 2y + -1y2 = -2y + 2y + y2 + -1y2

Combine like terms: -2y + 2y = 0
71 + 2y + -1y2 = 0 + y2 + -1y2
71 + 2y + -1y2 = y2 + -1y2

Combine like terms: y2 + -1y2 = 0
71 + 2y + -1y2 = 0

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

Divide each side by '-1'.
-71 + -2y + y2 = 0

Move the constant term to the right:

Add '71' to each side of the equation.
-71 + -2y + 71 + y2 = 0 + 71

Reorder the terms:
-71 + 71 + -2y + y2 = 0 + 71

Combine like terms: -71 + 71 = 0
0 + -2y + y2 = 0 + 71
-2y + y2 = 0 + 71

Combine like terms: 0 + 71 = 71
-2y + y2 = 71

The y term is -2y.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2y + 1 + y2 = 71 + 1

Reorder the terms:
1 + -2y + y2 = 71 + 1

Combine like terms: 71 + 1 = 72
1 + -2y + y2 = 72

Factor a perfect square on the left side:
(y + -1)(y + -1) = 72

Calculate the square root of the right side: 8.485281374

Break this problem into two subproblems by setting 
(y + -1) equal to 8.485281374 and -8.485281374.

Subproblem 1

y + -1 = 8.485281374 Simplifying y + -1 = 8.485281374 Reorder the terms: -1 + y = 8.485281374 Solving -1 + y = 8.485281374 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + y = 8.485281374 + 1 Combine like terms: -1 + 1 = 0 0 + y = 8.485281374 + 1 y = 8.485281374 + 1 Combine like terms: 8.485281374 + 1 = 9.485281374 y = 9.485281374 Simplifying y = 9.485281374

Subproblem 2

y + -1 = -8.485281374 Simplifying y + -1 = -8.485281374 Reorder the terms: -1 + y = -8.485281374 Solving -1 + y = -8.485281374 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + y = -8.485281374 + 1 Combine like terms: -1 + 1 = 0 0 + y = -8.485281374 + 1 y = -8.485281374 + 1 Combine like terms: -8.485281374 + 1 = -7.485281374 y = -7.485281374 Simplifying y = -7.485281374

Solution

The solution to the problem is based on the solutions from the subproblems. y = {9.485281374, -7.485281374}

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