5y^2+5y-74=0

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Solution for 5y^2+5y-74=0 equation:


Simplifying
5y2 + 5y + -74 = 0

Reorder the terms:
-74 + 5y + 5y2 = 0

Solving
-74 + 5y + 5y2 = 0

Solving for variable 'y'.

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

Divide each side by '5'.
-14.8 + y + y2 = 0

Move the constant term to the right:

Add '14.8' to each side of the equation.
-14.8 + y + 14.8 + y2 = 0 + 14.8

Reorder the terms:
-14.8 + 14.8 + y + y2 = 0 + 14.8

Combine like terms: -14.8 + 14.8 = 0.0
0.0 + y + y2 = 0 + 14.8
y + y2 = 0 + 14.8

Combine like terms: 0 + 14.8 = 14.8
y + y2 = 14.8

The y term is y.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + y2 = 14.8 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + y2 = 14.8 + 0.25

Combine like terms: 14.8 + 0.25 = 15.05
1.25 + y2 = 15.05

Factor a perfect square on the left side:
(y + 0.5)(y + 0.5) = 15.05

Calculate the square root of the right side: 3.879432948

Break this problem into two subproblems by setting 
(y + 0.5) equal to 3.879432948 and -3.879432948.

Subproblem 1

y + 0.5 = 3.879432948 Simplifying y + 0.5 = 3.879432948 Reorder the terms: 0.5 + y = 3.879432948 Solving 0.5 + y = 3.879432948 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + y = 3.879432948 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = 3.879432948 + -0.5 y = 3.879432948 + -0.5 Combine like terms: 3.879432948 + -0.5 = 3.379432948 y = 3.379432948 Simplifying y = 3.379432948

Subproblem 2

y + 0.5 = -3.879432948 Simplifying y + 0.5 = -3.879432948 Reorder the terms: 0.5 + y = -3.879432948 Solving 0.5 + y = -3.879432948 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + y = -3.879432948 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = -3.879432948 + -0.5 y = -3.879432948 + -0.5 Combine like terms: -3.879432948 + -0.5 = -4.379432948 y = -4.379432948 Simplifying y = -4.379432948

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.379432948, -4.379432948}

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