-3y+28=y^2+3y-28

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Solution for -3y+28=y^2+3y-28 equation:


Simplifying
-3y + 28 = y2 + 3y + -28

Reorder the terms:
28 + -3y = y2 + 3y + -28

Reorder the terms:
28 + -3y = -28 + 3y + y2

Solving
28 + -3y = -28 + 3y + y2

Solving for variable 'y'.

Reorder the terms:
28 + 28 + -3y + -3y + -1y2 = -28 + 3y + y2 + 28 + -3y + -1y2

Combine like terms: 28 + 28 = 56
56 + -3y + -3y + -1y2 = -28 + 3y + y2 + 28 + -3y + -1y2

Combine like terms: -3y + -3y = -6y
56 + -6y + -1y2 = -28 + 3y + y2 + 28 + -3y + -1y2

Reorder the terms:
56 + -6y + -1y2 = -28 + 28 + 3y + -3y + y2 + -1y2

Combine like terms: -28 + 28 = 0
56 + -6y + -1y2 = 0 + 3y + -3y + y2 + -1y2
56 + -6y + -1y2 = 3y + -3y + y2 + -1y2

Combine like terms: 3y + -3y = 0
56 + -6y + -1y2 = 0 + y2 + -1y2
56 + -6y + -1y2 = y2 + -1y2

Combine like terms: y2 + -1y2 = 0
56 + -6y + -1y2 = 0

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

Divide each side by '-1'.
-56 + 6y + y2 = 0

Move the constant term to the right:

Add '56' to each side of the equation.
-56 + 6y + 56 + y2 = 0 + 56

Reorder the terms:
-56 + 56 + 6y + y2 = 0 + 56

Combine like terms: -56 + 56 = 0
0 + 6y + y2 = 0 + 56
6y + y2 = 0 + 56

Combine like terms: 0 + 56 = 56
6y + y2 = 56

The y term is 6y.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6y + 9 + y2 = 56 + 9

Reorder the terms:
9 + 6y + y2 = 56 + 9

Combine like terms: 56 + 9 = 65
9 + 6y + y2 = 65

Factor a perfect square on the left side:
(y + 3)(y + 3) = 65

Calculate the square root of the right side: 8.062257748

Break this problem into two subproblems by setting 
(y + 3) equal to 8.062257748 and -8.062257748.

Subproblem 1

y + 3 = 8.062257748 Simplifying y + 3 = 8.062257748 Reorder the terms: 3 + y = 8.062257748 Solving 3 + y = 8.062257748 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + y = 8.062257748 + -3 Combine like terms: 3 + -3 = 0 0 + y = 8.062257748 + -3 y = 8.062257748 + -3 Combine like terms: 8.062257748 + -3 = 5.062257748 y = 5.062257748 Simplifying y = 5.062257748

Subproblem 2

y + 3 = -8.062257748 Simplifying y + 3 = -8.062257748 Reorder the terms: 3 + y = -8.062257748 Solving 3 + y = -8.062257748 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + y = -8.062257748 + -3 Combine like terms: 3 + -3 = 0 0 + y = -8.062257748 + -3 y = -8.062257748 + -3 Combine like terms: -8.062257748 + -3 = -11.062257748 y = -11.062257748 Simplifying y = -11.062257748

Solution

The solution to the problem is based on the solutions from the subproblems. y = {5.062257748, -11.062257748}

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