-y^2-25y+45=0

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Solution for -y^2-25y+45=0 equation:


Simplifying
-1y2 + -25y + 45 = 0

Reorder the terms:
45 + -25y + -1y2 = 0

Solving
45 + -25y + -1y2 = 0

Solving for variable 'y'.

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

Divide each side by '-1'.
-45 + 25y + y2 = 0

Move the constant term to the right:

Add '45' to each side of the equation.
-45 + 25y + 45 + y2 = 0 + 45

Reorder the terms:
-45 + 45 + 25y + y2 = 0 + 45

Combine like terms: -45 + 45 = 0
0 + 25y + y2 = 0 + 45
25y + y2 = 0 + 45

Combine like terms: 0 + 45 = 45
25y + y2 = 45

The y term is 25y.  Take half its coefficient (12.5).
Square it (156.25) and add it to both sides.

Add '156.25' to each side of the equation.
25y + 156.25 + y2 = 45 + 156.25

Reorder the terms:
156.25 + 25y + y2 = 45 + 156.25

Combine like terms: 45 + 156.25 = 201.25
156.25 + 25y + y2 = 201.25

Factor a perfect square on the left side:
(y + 12.5)(y + 12.5) = 201.25

Calculate the square root of the right side: 14.186260959

Break this problem into two subproblems by setting 
(y + 12.5) equal to 14.186260959 and -14.186260959.

Subproblem 1

y + 12.5 = 14.186260959 Simplifying y + 12.5 = 14.186260959 Reorder the terms: 12.5 + y = 14.186260959 Solving 12.5 + y = 14.186260959 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-12.5' to each side of the equation. 12.5 + -12.5 + y = 14.186260959 + -12.5 Combine like terms: 12.5 + -12.5 = 0.0 0.0 + y = 14.186260959 + -12.5 y = 14.186260959 + -12.5 Combine like terms: 14.186260959 + -12.5 = 1.686260959 y = 1.686260959 Simplifying y = 1.686260959

Subproblem 2

y + 12.5 = -14.186260959 Simplifying y + 12.5 = -14.186260959 Reorder the terms: 12.5 + y = -14.186260959 Solving 12.5 + y = -14.186260959 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-12.5' to each side of the equation. 12.5 + -12.5 + y = -14.186260959 + -12.5 Combine like terms: 12.5 + -12.5 = 0.0 0.0 + y = -14.186260959 + -12.5 y = -14.186260959 + -12.5 Combine like terms: -14.186260959 + -12.5 = -26.686260959 y = -26.686260959 Simplifying y = -26.686260959

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.686260959, -26.686260959}

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