5y-4y(y-6)+3=9

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Solution for 5y-4y(y-6)+3=9 equation:


Simplifying
5y + -4y(y + -6) + 3 = 9

Reorder the terms:
5y + -4y(-6 + y) + 3 = 9
5y + (-6 * -4y + y * -4y) + 3 = 9
5y + (24y + -4y2) + 3 = 9

Reorder the terms:
3 + 5y + 24y + -4y2 = 9

Combine like terms: 5y + 24y = 29y
3 + 29y + -4y2 = 9

Solving
3 + 29y + -4y2 = 9

Solving for variable 'y'.

Reorder the terms:
3 + -9 + 29y + -4y2 = 9 + -9

Combine like terms: 3 + -9 = -6
-6 + 29y + -4y2 = 9 + -9

Combine like terms: 9 + -9 = 0
-6 + 29y + -4y2 = 0

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

Divide each side by '-4'.
1.5 + -7.25y + y2 = 0

Move the constant term to the right:

Add '-1.5' to each side of the equation.
1.5 + -7.25y + -1.5 + y2 = 0 + -1.5

Reorder the terms:
1.5 + -1.5 + -7.25y + y2 = 0 + -1.5

Combine like terms: 1.5 + -1.5 = 0.0
0.0 + -7.25y + y2 = 0 + -1.5
-7.25y + y2 = 0 + -1.5

Combine like terms: 0 + -1.5 = -1.5
-7.25y + y2 = -1.5

The y term is -7.25y.  Take half its coefficient (-3.625).
Square it (13.140625) and add it to both sides.

Add '13.140625' to each side of the equation.
-7.25y + 13.140625 + y2 = -1.5 + 13.140625

Reorder the terms:
13.140625 + -7.25y + y2 = -1.5 + 13.140625

Combine like terms: -1.5 + 13.140625 = 11.640625
13.140625 + -7.25y + y2 = 11.640625

Factor a perfect square on the left side:
(y + -3.625)(y + -3.625) = 11.640625

Calculate the square root of the right side: 3.411836016

Break this problem into two subproblems by setting 
(y + -3.625) equal to 3.411836016 and -3.411836016.

Subproblem 1

y + -3.625 = 3.411836016 Simplifying y + -3.625 = 3.411836016 Reorder the terms: -3.625 + y = 3.411836016 Solving -3.625 + y = 3.411836016 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3.625' to each side of the equation. -3.625 + 3.625 + y = 3.411836016 + 3.625 Combine like terms: -3.625 + 3.625 = 0.000 0.000 + y = 3.411836016 + 3.625 y = 3.411836016 + 3.625 Combine like terms: 3.411836016 + 3.625 = 7.036836016 y = 7.036836016 Simplifying y = 7.036836016

Subproblem 2

y + -3.625 = -3.411836016 Simplifying y + -3.625 = -3.411836016 Reorder the terms: -3.625 + y = -3.411836016 Solving -3.625 + y = -3.411836016 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3.625' to each side of the equation. -3.625 + 3.625 + y = -3.411836016 + 3.625 Combine like terms: -3.625 + 3.625 = 0.000 0.000 + y = -3.411836016 + 3.625 y = -3.411836016 + 3.625 Combine like terms: -3.411836016 + 3.625 = 0.213163984 y = 0.213163984 Simplifying y = 0.213163984

Solution

The solution to the problem is based on the solutions from the subproblems. y = {7.036836016, 0.213163984}

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