3-y=y^2

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Solution for 3-y=y^2 equation:


Simplifying
3 + -1y = y2

Solving
3 + -1y = y2

Solving for variable 'y'.

Combine like terms: y2 + -1y2 = 0
3 + -1y + -1y2 = 0

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

Divide each side by '-1'.
-3 + y + y2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + y + 3 + y2 = 0 + 3

Reorder the terms:
-3 + 3 + y + y2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + y + y2 = 0 + 3
y + y2 = 0 + 3

Combine like terms: 0 + 3 = 3
y + y2 = 3

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.
 + 0.25 + y2 = 3 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + y2 = 3 + 0.25

Combine like terms: 3 + 0.25 = 3.25
1.25 + y2 = 3.25

Factor a perfect square on the left side:
(y + 0.5)(y + 0.5) = 3.25

Calculate the square root of the right side: 1.802775638

Break this problem into two subproblems by setting 
(y + 0.5) equal to 1.802775638 and -1.802775638.

Subproblem 1

y + 0.5 = 1.802775638 Simplifying y + 0.5 = 1.802775638 Reorder the terms: 0.5 + y = 1.802775638 Solving 0.5 + y = 1.802775638 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 = 1.802775638 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = 1.802775638 + -0.5 y = 1.802775638 + -0.5 Combine like terms: 1.802775638 + -0.5 = 1.302775638 y = 1.302775638 Simplifying y = 1.302775638

Subproblem 2

y + 0.5 = -1.802775638 Simplifying y + 0.5 = -1.802775638 Reorder the terms: 0.5 + y = -1.802775638 Solving 0.5 + y = -1.802775638 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 = -1.802775638 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = -1.802775638 + -0.5 y = -1.802775638 + -0.5 Combine like terms: -1.802775638 + -0.5 = -2.302775638 y = -2.302775638 Simplifying y = -2.302775638

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.302775638, -2.302775638}

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