5y^2-16y+4=0

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Solution for 5y^2-16y+4=0 equation:


Simplifying
5y2 + -16y + 4 = 0

Reorder the terms:
4 + -16y + 5y2 = 0

Solving
4 + -16y + 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'.
0.8 + -3.2y + y2 = 0

Move the constant term to the right:

Add '-0.8' to each side of the equation.
0.8 + -3.2y + -0.8 + y2 = 0 + -0.8

Reorder the terms:
0.8 + -0.8 + -3.2y + y2 = 0 + -0.8

Combine like terms: 0.8 + -0.8 = 0.0
0.0 + -3.2y + y2 = 0 + -0.8
-3.2y + y2 = 0 + -0.8

Combine like terms: 0 + -0.8 = -0.8
-3.2y + y2 = -0.8

The y term is -3.2y.  Take half its coefficient (-1.6).
Square it (2.56) and add it to both sides.

Add '2.56' to each side of the equation.
-3.2y + 2.56 + y2 = -0.8 + 2.56

Reorder the terms:
2.56 + -3.2y + y2 = -0.8 + 2.56

Combine like terms: -0.8 + 2.56 = 1.76
2.56 + -3.2y + y2 = 1.76

Factor a perfect square on the left side:
(y + -1.6)(y + -1.6) = 1.76

Calculate the square root of the right side: 1.326649916

Break this problem into two subproblems by setting 
(y + -1.6) equal to 1.326649916 and -1.326649916.

Subproblem 1

y + -1.6 = 1.326649916 Simplifying y + -1.6 = 1.326649916 Reorder the terms: -1.6 + y = 1.326649916 Solving -1.6 + y = 1.326649916 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.6' to each side of the equation. -1.6 + 1.6 + y = 1.326649916 + 1.6 Combine like terms: -1.6 + 1.6 = 0.0 0.0 + y = 1.326649916 + 1.6 y = 1.326649916 + 1.6 Combine like terms: 1.326649916 + 1.6 = 2.926649916 y = 2.926649916 Simplifying y = 2.926649916

Subproblem 2

y + -1.6 = -1.326649916 Simplifying y + -1.6 = -1.326649916 Reorder the terms: -1.6 + y = -1.326649916 Solving -1.6 + y = -1.326649916 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.6' to each side of the equation. -1.6 + 1.6 + y = -1.326649916 + 1.6 Combine like terms: -1.6 + 1.6 = 0.0 0.0 + y = -1.326649916 + 1.6 y = -1.326649916 + 1.6 Combine like terms: -1.326649916 + 1.6 = 0.273350084 y = 0.273350084 Simplifying y = 0.273350084

Solution

The solution to the problem is based on the solutions from the subproblems. y = {2.926649916, 0.273350084}

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