4y^2+6y-90=0

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Solution for 4y^2+6y-90=0 equation: 


Simplifying
4y2 + 6y + -90 = 0

Reorder the terms:
-90 + 6y + 4y2 = 0

Solving
-90 + 6y + 4y2 = 0

Solving for variable 'y'.

Factor out the Greatest Common Factor (GCF), '2'.
2(-45 + 3y + 2y2) = 0

Ignore the factor 2.

Subproblem 1
Set the factor '(-45 + 3y + 2y2)' equal to zero and attempt to solve:

Simplifying
-45 + 3y + 2y2 = 0

Solving
-45 + 3y + 2y2 = 0

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

Divide each side by '2'.
-22.5 + 1.5y + y2 = 0

Move the constant term to the right:

Add '22.5' to each side of the equation.
-22.5 + 1.5y + 22.5 + y2 = 0 + 22.5

Reorder the terms:
-22.5 + 22.5 + 1.5y + y2 = 0 + 22.5

Combine like terms: -22.5 + 22.5 = 0.0
0.0 + 1.5y + y2 = 0 + 22.5
1.5y + y2 = 0 + 22.5

Combine like terms: 0 + 22.5 = 22.5
1.5y + y2 = 22.5

The y term is 1.5y.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5y + 0.5625 + y2 = 22.5 + 0.5625

Reorder the terms:
0.5625 + 1.5y + y2 = 22.5 + 0.5625

Combine like terms: 22.5 + 0.5625 = 23.0625
0.5625 + 1.5y + y2 = 23.0625

Factor a perfect square on the left side:
(y + 0.75)(y + 0.75) = 23.0625

Calculate the square root of the right side: 4.802343178

Break this problem into two subproblems by setting 
(y + 0.75) equal to 4.802343178 and -4.802343178.


Subproblem 1
y + 0.75 = 4.802343178

Simplifying
y + 0.75 = 4.802343178

Reorder the terms:
0.75 + y = 4.802343178

Solving
0.75 + y = 4.802343178

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Add '-0.75' to each side of the equation.
0.75 + -0.75 + y = 4.802343178 + -0.75

Combine like terms: 0.75 + -0.75 = 0.00
0.00 + y = 4.802343178 + -0.75
y = 4.802343178 + -0.75

Combine like terms: 4.802343178 + -0.75 = 4.052343178
y = 4.052343178

Simplifying
y = 4.052343178


Subproblem 2
y + 0.75 = -4.802343178

Simplifying
y + 0.75 = -4.802343178

Reorder the terms:
0.75 + y = -4.802343178

Solving
0.75 + y = -4.802343178

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Add '-0.75' to each side of the equation.
0.75 + -0.75 + y = -4.802343178 + -0.75

Combine like terms: 0.75 + -0.75 = 0.00
0.00 + y = -4.802343178 + -0.75
y = -4.802343178 + -0.75

Combine like terms: -4.802343178 + -0.75 = -5.552343178
y = -5.552343178

Simplifying
y = -5.552343178


Solution
The solution to the problem is based on the solutions
from the subproblems.
y = {4.052343178, -5.552343178}
Solution
y = {4.052343178, -5.552343178}

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