5y^2-17y+4=0

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Solution for 5y^2-17y+4=0 equation:


Simplifying
5y2 + -17y + 4 = 0

Reorder the terms:
4 + -17y + 5y2 = 0

Solving
4 + -17y + 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 + -3.4y + y2 = 0

Move the constant term to the right:

Add '-0.8' to each side of the equation.
0.8 + -3.4y + -0.8 + y2 = 0 + -0.8

Reorder the terms:
0.8 + -0.8 + -3.4y + y2 = 0 + -0.8

Combine like terms: 0.8 + -0.8 = 0.0
0.0 + -3.4y + y2 = 0 + -0.8
-3.4y + y2 = 0 + -0.8

Combine like terms: 0 + -0.8 = -0.8
-3.4y + y2 = -0.8

The y term is -3.4y.  Take half its coefficient (-1.7).
Square it (2.89) and add it to both sides.

Add '2.89' to each side of the equation.
-3.4y + 2.89 + y2 = -0.8 + 2.89

Reorder the terms:
2.89 + -3.4y + y2 = -0.8 + 2.89

Combine like terms: -0.8 + 2.89 = 2.09
2.89 + -3.4y + y2 = 2.09

Factor a perfect square on the left side:
(y + -1.7)(y + -1.7) = 2.09

Calculate the square root of the right side: 1.445683229

Break this problem into two subproblems by setting 
(y + -1.7) equal to 1.445683229 and -1.445683229.

Subproblem 1

y + -1.7 = 1.445683229 Simplifying y + -1.7 = 1.445683229 Reorder the terms: -1.7 + y = 1.445683229 Solving -1.7 + y = 1.445683229 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.7' to each side of the equation. -1.7 + 1.7 + y = 1.445683229 + 1.7 Combine like terms: -1.7 + 1.7 = 0.0 0.0 + y = 1.445683229 + 1.7 y = 1.445683229 + 1.7 Combine like terms: 1.445683229 + 1.7 = 3.145683229 y = 3.145683229 Simplifying y = 3.145683229

Subproblem 2

y + -1.7 = -1.445683229 Simplifying y + -1.7 = -1.445683229 Reorder the terms: -1.7 + y = -1.445683229 Solving -1.7 + y = -1.445683229 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.7' to each side of the equation. -1.7 + 1.7 + y = -1.445683229 + 1.7 Combine like terms: -1.7 + 1.7 = 0.0 0.0 + y = -1.445683229 + 1.7 y = -1.445683229 + 1.7 Combine like terms: -1.445683229 + 1.7 = 0.254316771 y = 0.254316771 Simplifying y = 0.254316771

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.145683229, 0.254316771}

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