2y^2+90y+625=0

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Solution for 2y^2+90y+625=0 equation:


Simplifying
2y2 + 90y + 625 = 0

Reorder the terms:
625 + 90y + 2y2 = 0

Solving
625 + 90y + 2y2 = 0

Solving for variable 'y'.

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

Divide each side by '2'.
312.5 + 45y + y2 = 0

Move the constant term to the right:

Add '-312.5' to each side of the equation.
312.5 + 45y + -312.5 + y2 = 0 + -312.5

Reorder the terms:
312.5 + -312.5 + 45y + y2 = 0 + -312.5

Combine like terms: 312.5 + -312.5 = 0.0
0.0 + 45y + y2 = 0 + -312.5
45y + y2 = 0 + -312.5

Combine like terms: 0 + -312.5 = -312.5
45y + y2 = -312.5

The y term is 45y.  Take half its coefficient (22.5).
Square it (506.25) and add it to both sides.

Add '506.25' to each side of the equation.
45y + 506.25 + y2 = -312.5 + 506.25

Reorder the terms:
506.25 + 45y + y2 = -312.5 + 506.25

Combine like terms: -312.5 + 506.25 = 193.75
506.25 + 45y + y2 = 193.75

Factor a perfect square on the left side:
(y + 22.5)(y + 22.5) = 193.75

Calculate the square root of the right side: 13.919410907

Break this problem into two subproblems by setting 
(y + 22.5) equal to 13.919410907 and -13.919410907.

Subproblem 1

y + 22.5 = 13.919410907 Simplifying y + 22.5 = 13.919410907 Reorder the terms: 22.5 + y = 13.919410907 Solving 22.5 + y = 13.919410907 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-22.5' to each side of the equation. 22.5 + -22.5 + y = 13.919410907 + -22.5 Combine like terms: 22.5 + -22.5 = 0.0 0.0 + y = 13.919410907 + -22.5 y = 13.919410907 + -22.5 Combine like terms: 13.919410907 + -22.5 = -8.580589093 y = -8.580589093 Simplifying y = -8.580589093

Subproblem 2

y + 22.5 = -13.919410907 Simplifying y + 22.5 = -13.919410907 Reorder the terms: 22.5 + y = -13.919410907 Solving 22.5 + y = -13.919410907 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-22.5' to each side of the equation. 22.5 + -22.5 + y = -13.919410907 + -22.5 Combine like terms: 22.5 + -22.5 = 0.0 0.0 + y = -13.919410907 + -22.5 y = -13.919410907 + -22.5 Combine like terms: -13.919410907 + -22.5 = -36.419410907 y = -36.419410907 Simplifying y = -36.419410907

Solution

The solution to the problem is based on the solutions from the subproblems. y = {-8.580589093, -36.419410907}

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