5y+4y(y-7)=4(y+2)-4

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Solution for 5y+4y(y-7)=4(y+2)-4 equation:


Simplifying
5y + 4y(y + -7) = 4(y + 2) + -4

Reorder the terms:
5y + 4y(-7 + y) = 4(y + 2) + -4
5y + (-7 * 4y + y * 4y) = 4(y + 2) + -4
5y + (-28y + 4y2) = 4(y + 2) + -4

Combine like terms: 5y + -28y = -23y
-23y + 4y2 = 4(y + 2) + -4

Reorder the terms:
-23y + 4y2 = 4(2 + y) + -4
-23y + 4y2 = (2 * 4 + y * 4) + -4
-23y + 4y2 = (8 + 4y) + -4

Reorder the terms:
-23y + 4y2 = 8 + -4 + 4y

Combine like terms: 8 + -4 = 4
-23y + 4y2 = 4 + 4y

Solving
-23y + 4y2 = 4 + 4y

Solving for variable 'y'.

Reorder the terms:
-4 + -23y + -4y + 4y2 = 4 + 4y + -4 + -4y

Combine like terms: -23y + -4y = -27y
-4 + -27y + 4y2 = 4 + 4y + -4 + -4y

Reorder the terms:
-4 + -27y + 4y2 = 4 + -4 + 4y + -4y

Combine like terms: 4 + -4 = 0
-4 + -27y + 4y2 = 0 + 4y + -4y
-4 + -27y + 4y2 = 4y + -4y

Combine like terms: 4y + -4y = 0
-4 + -27y + 4y2 = 0

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

Divide each side by '4'.
-1 + -6.75y + y2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -6.75y + 1 + y2 = 0 + 1

Reorder the terms:
-1 + 1 + -6.75y + y2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -6.75y + y2 = 0 + 1
-6.75y + y2 = 0 + 1

Combine like terms: 0 + 1 = 1
-6.75y + y2 = 1

The y term is -6.75y.  Take half its coefficient (-3.375).
Square it (11.390625) and add it to both sides.

Add '11.390625' to each side of the equation.
-6.75y + 11.390625 + y2 = 1 + 11.390625

Reorder the terms:
11.390625 + -6.75y + y2 = 1 + 11.390625

Combine like terms: 1 + 11.390625 = 12.390625
11.390625 + -6.75y + y2 = 12.390625

Factor a perfect square on the left side:
(y + -3.375)(y + -3.375) = 12.390625

Calculate the square root of the right side: 3.52003196

Break this problem into two subproblems by setting 
(y + -3.375) equal to 3.52003196 and -3.52003196.

Subproblem 1

y + -3.375 = 3.52003196 Simplifying y + -3.375 = 3.52003196 Reorder the terms: -3.375 + y = 3.52003196 Solving -3.375 + y = 3.52003196 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3.375' to each side of the equation. -3.375 + 3.375 + y = 3.52003196 + 3.375 Combine like terms: -3.375 + 3.375 = 0.000 0.000 + y = 3.52003196 + 3.375 y = 3.52003196 + 3.375 Combine like terms: 3.52003196 + 3.375 = 6.89503196 y = 6.89503196 Simplifying y = 6.89503196

Subproblem 2

y + -3.375 = -3.52003196 Simplifying y + -3.375 = -3.52003196 Reorder the terms: -3.375 + y = -3.52003196 Solving -3.375 + y = -3.52003196 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3.375' to each side of the equation. -3.375 + 3.375 + y = -3.52003196 + 3.375 Combine like terms: -3.375 + 3.375 = 0.000 0.000 + y = -3.52003196 + 3.375 y = -3.52003196 + 3.375 Combine like terms: -3.52003196 + 3.375 = -0.14503196 y = -0.14503196 Simplifying y = -0.14503196

Solution

The solution to the problem is based on the solutions from the subproblems. y = {6.89503196, -0.14503196}

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