y=y^2-625+4y-100+15

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Solution for y=y^2-625+4y-100+15 equation:


Simplifying
y = y2 + -625 + 4y + -100 + 15

Reorder the terms:
y = -625 + -100 + 15 + 4y + y2

Combine like terms: -625 + -100 = -725
y = -725 + 15 + 4y + y2

Combine like terms: -725 + 15 = -710
y = -710 + 4y + y2

Solving
y = -710 + 4y + y2

Solving for variable 'y'.

Reorder the terms:
710 + y + -4y + -1y2 = -710 + 4y + y2 + 710 + -4y + -1y2

Combine like terms: y + -4y = -3y
710 + -3y + -1y2 = -710 + 4y + y2 + 710 + -4y + -1y2

Reorder the terms:
710 + -3y + -1y2 = -710 + 710 + 4y + -4y + y2 + -1y2

Combine like terms: -710 + 710 = 0
710 + -3y + -1y2 = 0 + 4y + -4y + y2 + -1y2
710 + -3y + -1y2 = 4y + -4y + y2 + -1y2

Combine like terms: 4y + -4y = 0
710 + -3y + -1y2 = 0 + y2 + -1y2
710 + -3y + -1y2 = y2 + -1y2

Combine like terms: y2 + -1y2 = 0
710 + -3y + -1y2 = 0

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

Divide each side by '-1'.
-710 + 3y + y2 = 0

Move the constant term to the right:

Add '710' to each side of the equation.
-710 + 3y + 710 + y2 = 0 + 710

Reorder the terms:
-710 + 710 + 3y + y2 = 0 + 710

Combine like terms: -710 + 710 = 0
0 + 3y + y2 = 0 + 710
3y + y2 = 0 + 710

Combine like terms: 0 + 710 = 710
3y + y2 = 710

The y term is 3y.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3y + 2.25 + y2 = 710 + 2.25

Reorder the terms:
2.25 + 3y + y2 = 710 + 2.25

Combine like terms: 710 + 2.25 = 712.25
2.25 + 3y + y2 = 712.25

Factor a perfect square on the left side:
(y + 1.5)(y + 1.5) = 712.25

Calculate the square root of the right side: 26.68801229

Break this problem into two subproblems by setting 
(y + 1.5) equal to 26.68801229 and -26.68801229.

Subproblem 1

y + 1.5 = 26.68801229 Simplifying y + 1.5 = 26.68801229 Reorder the terms: 1.5 + y = 26.68801229 Solving 1.5 + y = 26.68801229 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + y = 26.68801229 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + y = 26.68801229 + -1.5 y = 26.68801229 + -1.5 Combine like terms: 26.68801229 + -1.5 = 25.18801229 y = 25.18801229 Simplifying y = 25.18801229

Subproblem 2

y + 1.5 = -26.68801229 Simplifying y + 1.5 = -26.68801229 Reorder the terms: 1.5 + y = -26.68801229 Solving 1.5 + y = -26.68801229 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + y = -26.68801229 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + y = -26.68801229 + -1.5 y = -26.68801229 + -1.5 Combine like terms: -26.68801229 + -1.5 = -28.18801229 y = -28.18801229 Simplifying y = -28.18801229

Solution

The solution to the problem is based on the solutions from the subproblems. y = {25.18801229, -28.18801229}

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