5y^2-51y+18=0

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Solution for 5y^2-51y+18=0 equation:


Simplifying
5y2 + -51y + 18 = 0

Reorder the terms:
18 + -51y + 5y2 = 0

Solving
18 + -51y + 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'.
3.6 + -10.2y + y2 = 0

Move the constant term to the right:

Add '-3.6' to each side of the equation.
3.6 + -10.2y + -3.6 + y2 = 0 + -3.6

Reorder the terms:
3.6 + -3.6 + -10.2y + y2 = 0 + -3.6

Combine like terms: 3.6 + -3.6 = 0.0
0.0 + -10.2y + y2 = 0 + -3.6
-10.2y + y2 = 0 + -3.6

Combine like terms: 0 + -3.6 = -3.6
-10.2y + y2 = -3.6

The y term is -10.2y.  Take half its coefficient (-5.1).
Square it (26.01) and add it to both sides.

Add '26.01' to each side of the equation.
-10.2y + 26.01 + y2 = -3.6 + 26.01

Reorder the terms:
26.01 + -10.2y + y2 = -3.6 + 26.01

Combine like terms: -3.6 + 26.01 = 22.41
26.01 + -10.2y + y2 = 22.41

Factor a perfect square on the left side:
(y + -5.1)(y + -5.1) = 22.41

Calculate the square root of the right side: 4.733920151

Break this problem into two subproblems by setting 
(y + -5.1) equal to 4.733920151 and -4.733920151.

Subproblem 1

y + -5.1 = 4.733920151 Simplifying y + -5.1 = 4.733920151 Reorder the terms: -5.1 + y = 4.733920151 Solving -5.1 + y = 4.733920151 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '5.1' to each side of the equation. -5.1 + 5.1 + y = 4.733920151 + 5.1 Combine like terms: -5.1 + 5.1 = 0.0 0.0 + y = 4.733920151 + 5.1 y = 4.733920151 + 5.1 Combine like terms: 4.733920151 + 5.1 = 9.833920151 y = 9.833920151 Simplifying y = 9.833920151

Subproblem 2

y + -5.1 = -4.733920151 Simplifying y + -5.1 = -4.733920151 Reorder the terms: -5.1 + y = -4.733920151 Solving -5.1 + y = -4.733920151 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '5.1' to each side of the equation. -5.1 + 5.1 + y = -4.733920151 + 5.1 Combine like terms: -5.1 + 5.1 = 0.0 0.0 + y = -4.733920151 + 5.1 y = -4.733920151 + 5.1 Combine like terms: -4.733920151 + 5.1 = 0.366079849 y = 0.366079849 Simplifying y = 0.366079849

Solution

The solution to the problem is based on the solutions from the subproblems. y = {9.833920151, 0.366079849}

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