12+y=34-y^2

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Solution for 12+y=34-y^2 equation:


Simplifying
12 + y = 34 + -1y2

Solving
12 + y = 34 + -1y2

Solving for variable 'y'.

Reorder the terms:
12 + -34 + y + y2 = 34 + -1y2 + -34 + y2

Combine like terms: 12 + -34 = -22
-22 + y + y2 = 34 + -1y2 + -34 + y2

Reorder the terms:
-22 + y + y2 = 34 + -34 + -1y2 + y2

Combine like terms: 34 + -34 = 0
-22 + y + y2 = 0 + -1y2 + y2
-22 + y + y2 = -1y2 + y2

Combine like terms: -1y2 + y2 = 0
-22 + y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '22' to each side of the equation.
-22 + y + 22 + y2 = 0 + 22

Reorder the terms:
-22 + 22 + y + y2 = 0 + 22

Combine like terms: -22 + 22 = 0
0 + y + y2 = 0 + 22
y + y2 = 0 + 22

Combine like terms: 0 + 22 = 22
y + y2 = 22

The y term is y.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
y + 0.25 + y2 = 22 + 0.25

Reorder the terms:
0.25 + y + y2 = 22 + 0.25

Combine like terms: 22 + 0.25 = 22.25
0.25 + y + y2 = 22.25

Factor a perfect square on the left side:
(y + 0.5)(y + 0.5) = 22.25

Calculate the square root of the right side: 4.716990566

Break this problem into two subproblems by setting 
(y + 0.5) equal to 4.716990566 and -4.716990566.

Subproblem 1

y + 0.5 = 4.716990566 Simplifying y + 0.5 = 4.716990566 Reorder the terms: 0.5 + y = 4.716990566 Solving 0.5 + y = 4.716990566 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + y = 4.716990566 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = 4.716990566 + -0.5 y = 4.716990566 + -0.5 Combine like terms: 4.716990566 + -0.5 = 4.216990566 y = 4.216990566 Simplifying y = 4.216990566

Subproblem 2

y + 0.5 = -4.716990566 Simplifying y + 0.5 = -4.716990566 Reorder the terms: 0.5 + y = -4.716990566 Solving 0.5 + y = -4.716990566 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + y = -4.716990566 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = -4.716990566 + -0.5 y = -4.716990566 + -0.5 Combine like terms: -4.716990566 + -0.5 = -5.216990566 y = -5.216990566 Simplifying y = -5.216990566

Solution

The solution to the problem is based on the solutions from the subproblems. y = {4.216990566, -5.216990566}

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