5y^2-8y=27

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Solution for 5y^2-8y=27 equation:


Simplifying
5y2 + -8y = 27

Reorder the terms:
-8y + 5y2 = 27

Solving
-8y + 5y2 = 27

Solving for variable 'y'.

Reorder the terms:
-27 + -8y + 5y2 = 27 + -27

Combine like terms: 27 + -27 = 0
-27 + -8y + 5y2 = 0

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

Divide each side by '5'.
-5.4 + -1.6y + y2 = 0

Move the constant term to the right:

Add '5.4' to each side of the equation.
-5.4 + -1.6y + 5.4 + y2 = 0 + 5.4

Reorder the terms:
-5.4 + 5.4 + -1.6y + y2 = 0 + 5.4

Combine like terms: -5.4 + 5.4 = 0.0
0.0 + -1.6y + y2 = 0 + 5.4
-1.6y + y2 = 0 + 5.4

Combine like terms: 0 + 5.4 = 5.4
-1.6y + y2 = 5.4

The y term is -1.6y.  Take half its coefficient (-0.8).
Square it (0.64) and add it to both sides.

Add '0.64' to each side of the equation.
-1.6y + 0.64 + y2 = 5.4 + 0.64

Reorder the terms:
0.64 + -1.6y + y2 = 5.4 + 0.64

Combine like terms: 5.4 + 0.64 = 6.04
0.64 + -1.6y + y2 = 6.04

Factor a perfect square on the left side:
(y + -0.8)(y + -0.8) = 6.04

Calculate the square root of the right side: 2.457641145

Break this problem into two subproblems by setting 
(y + -0.8) equal to 2.457641145 and -2.457641145.

Subproblem 1

y + -0.8 = 2.457641145 Simplifying y + -0.8 = 2.457641145 Reorder the terms: -0.8 + y = 2.457641145 Solving -0.8 + y = 2.457641145 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + y = 2.457641145 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + y = 2.457641145 + 0.8 y = 2.457641145 + 0.8 Combine like terms: 2.457641145 + 0.8 = 3.257641145 y = 3.257641145 Simplifying y = 3.257641145

Subproblem 2

y + -0.8 = -2.457641145 Simplifying y + -0.8 = -2.457641145 Reorder the terms: -0.8 + y = -2.457641145 Solving -0.8 + y = -2.457641145 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + y = -2.457641145 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + y = -2.457641145 + 0.8 y = -2.457641145 + 0.8 Combine like terms: -2.457641145 + 0.8 = -1.657641145 y = -1.657641145 Simplifying y = -1.657641145

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.257641145, -1.657641145}

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