-26.42y+18.6y^2=90.8

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Solution for -26.42y+18.6y^2=90.8 equation:


Simplifying
-26.42y + 18.6y2 = 90.8

Solving
-26.42y + 18.6y2 = 90.8

Solving for variable 'y'.

Reorder the terms:
-90.8 + -26.42y + 18.6y2 = 90.8 + -90.8

Combine like terms: 90.8 + -90.8 = 0.0
-90.8 + -26.42y + 18.6y2 = 0.0

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

Divide each side by '18.6'.
-4.88172043 + -1.420430108y + y2 = 0

Move the constant term to the right:

Add '4.88172043' to each side of the equation.
-4.88172043 + -1.420430108y + 4.88172043 + y2 = 0 + 4.88172043

Reorder the terms:
-4.88172043 + 4.88172043 + -1.420430108y + y2 = 0 + 4.88172043

Combine like terms: -4.88172043 + 4.88172043 = 0.00000000
0.00000000 + -1.420430108y + y2 = 0 + 4.88172043
-1.420430108y + y2 = 0 + 4.88172043

Combine like terms: 0 + 4.88172043 = 4.88172043
-1.420430108y + y2 = 4.88172043

The y term is -1.420430108y.  Take half its coefficient (-0.710215054).
Square it (0.5044054229) and add it to both sides.

Add '0.5044054229' to each side of the equation.
-1.420430108y + 0.5044054229 + y2 = 4.88172043 + 0.5044054229

Reorder the terms:
0.5044054229 + -1.420430108y + y2 = 4.88172043 + 0.5044054229

Combine like terms: 4.88172043 + 0.5044054229 = 5.3861258529
0.5044054229 + -1.420430108y + y2 = 5.3861258529

Factor a perfect square on the left side:
(y + -0.710215054)(y + -0.710215054) = 5.3861258529

Calculate the square root of the right side: 2.320802847

Break this problem into two subproblems by setting 
(y + -0.710215054) equal to 2.320802847 and -2.320802847.

Subproblem 1

y + -0.710215054 = 2.320802847 Simplifying y + -0.710215054 = 2.320802847 Reorder the terms: -0.710215054 + y = 2.320802847 Solving -0.710215054 + y = 2.320802847 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.710215054' to each side of the equation. -0.710215054 + 0.710215054 + y = 2.320802847 + 0.710215054 Combine like terms: -0.710215054 + 0.710215054 = 0.000000000 0.000000000 + y = 2.320802847 + 0.710215054 y = 2.320802847 + 0.710215054 Combine like terms: 2.320802847 + 0.710215054 = 3.031017901 y = 3.031017901 Simplifying y = 3.031017901

Subproblem 2

y + -0.710215054 = -2.320802847 Simplifying y + -0.710215054 = -2.320802847 Reorder the terms: -0.710215054 + y = -2.320802847 Solving -0.710215054 + y = -2.320802847 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.710215054' to each side of the equation. -0.710215054 + 0.710215054 + y = -2.320802847 + 0.710215054 Combine like terms: -0.710215054 + 0.710215054 = 0.000000000 0.000000000 + y = -2.320802847 + 0.710215054 y = -2.320802847 + 0.710215054 Combine like terms: -2.320802847 + 0.710215054 = -1.610587793 y = -1.610587793 Simplifying y = -1.610587793

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.031017901, -1.610587793}

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