-9=5y^2-47y

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Solution for -9=5y^2-47y equation:


Simplifying
-9 = 5y2 + -47y

Reorder the terms:
-9 = -47y + 5y2

Solving
-9 = -47y + 5y2

Solving for variable 'y'.

Reorder the terms:
-9 + 47y + -5y2 = -47y + 47y + 5y2 + -5y2

Combine like terms: -47y + 47y = 0
-9 + 47y + -5y2 = 0 + 5y2 + -5y2
-9 + 47y + -5y2 = 5y2 + -5y2

Combine like terms: 5y2 + -5y2 = 0
-9 + 47y + -5y2 = 0

Begin completing the square.  Divide all terms by
-5 the coefficient of the squared term: 

Divide each side by '-5'.
1.8 + -9.4y + y2 = 0

Move the constant term to the right:

Add '-1.8' to each side of the equation.
1.8 + -9.4y + -1.8 + y2 = 0 + -1.8

Reorder the terms:
1.8 + -1.8 + -9.4y + y2 = 0 + -1.8

Combine like terms: 1.8 + -1.8 = 0.0
0.0 + -9.4y + y2 = 0 + -1.8
-9.4y + y2 = 0 + -1.8

Combine like terms: 0 + -1.8 = -1.8
-9.4y + y2 = -1.8

The y term is -9.4y.  Take half its coefficient (-4.7).
Square it (22.09) and add it to both sides.

Add '22.09' to each side of the equation.
-9.4y + 22.09 + y2 = -1.8 + 22.09

Reorder the terms:
22.09 + -9.4y + y2 = -1.8 + 22.09

Combine like terms: -1.8 + 22.09 = 20.29
22.09 + -9.4y + y2 = 20.29

Factor a perfect square on the left side:
(y + -4.7)(y + -4.7) = 20.29

Calculate the square root of the right side: 4.504442252

Break this problem into two subproblems by setting 
(y + -4.7) equal to 4.504442252 and -4.504442252.

Subproblem 1

y + -4.7 = 4.504442252 Simplifying y + -4.7 = 4.504442252 Reorder the terms: -4.7 + y = 4.504442252 Solving -4.7 + y = 4.504442252 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '4.7' to each side of the equation. -4.7 + 4.7 + y = 4.504442252 + 4.7 Combine like terms: -4.7 + 4.7 = 0.0 0.0 + y = 4.504442252 + 4.7 y = 4.504442252 + 4.7 Combine like terms: 4.504442252 + 4.7 = 9.204442252 y = 9.204442252 Simplifying y = 9.204442252

Subproblem 2

y + -4.7 = -4.504442252 Simplifying y + -4.7 = -4.504442252 Reorder the terms: -4.7 + y = -4.504442252 Solving -4.7 + y = -4.504442252 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '4.7' to each side of the equation. -4.7 + 4.7 + y = -4.504442252 + 4.7 Combine like terms: -4.7 + 4.7 = 0.0 0.0 + y = -4.504442252 + 4.7 y = -4.504442252 + 4.7 Combine like terms: -4.504442252 + 4.7 = 0.195557748 y = 0.195557748 Simplifying y = 0.195557748

Solution

The solution to the problem is based on the solutions from the subproblems. y = {9.204442252, 0.195557748}

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