20+3y=4y^2

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Solution for 20+3y=4y^2 equation:


Simplifying
20 + 3y = 4y2

Solving
20 + 3y = 4y2

Solving for variable 'y'.

Combine like terms: 4y2 + -4y2 = 0
20 + 3y + -4y2 = 0

Begin completing the square.  Divide all terms by
-4 the coefficient of the squared term: 

Divide each side by '-4'.
-5 + -0.75y + y2 = 0

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -0.75y + 5 + y2 = 0 + 5

Reorder the terms:
-5 + 5 + -0.75y + y2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -0.75y + y2 = 0 + 5
-0.75y + y2 = 0 + 5

Combine like terms: 0 + 5 = 5
-0.75y + y2 = 5

The y term is -0.75y.  Take half its coefficient (-0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
-0.75y + 0.140625 + y2 = 5 + 0.140625

Reorder the terms:
0.140625 + -0.75y + y2 = 5 + 0.140625

Combine like terms: 5 + 0.140625 = 5.140625
0.140625 + -0.75y + y2 = 5.140625

Factor a perfect square on the left side:
(y + -0.375)(y + -0.375) = 5.140625

Calculate the square root of the right side: 2.267294643

Break this problem into two subproblems by setting 
(y + -0.375) equal to 2.267294643 and -2.267294643.

Subproblem 1

y + -0.375 = 2.267294643 Simplifying y + -0.375 = 2.267294643 Reorder the terms: -0.375 + y = 2.267294643 Solving -0.375 + y = 2.267294643 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + y = 2.267294643 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + y = 2.267294643 + 0.375 y = 2.267294643 + 0.375 Combine like terms: 2.267294643 + 0.375 = 2.642294643 y = 2.642294643 Simplifying y = 2.642294643

Subproblem 2

y + -0.375 = -2.267294643 Simplifying y + -0.375 = -2.267294643 Reorder the terms: -0.375 + y = -2.267294643 Solving -0.375 + y = -2.267294643 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + y = -2.267294643 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + y = -2.267294643 + 0.375 y = -2.267294643 + 0.375 Combine like terms: -2.267294643 + 0.375 = -1.892294643 y = -1.892294643 Simplifying y = -1.892294643

Solution

The solution to the problem is based on the solutions from the subproblems. y = {2.642294643, -1.892294643}

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