(2y-7)(2y-7)=12

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Solution for (2y-7)(2y-7)=12 equation:


Simplifying
(2y + -7)(2y + -7) = 12

Reorder the terms:
(-7 + 2y)(2y + -7) = 12

Reorder the terms:
(-7 + 2y)(-7 + 2y) = 12

Multiply (-7 + 2y) * (-7 + 2y)
(-7(-7 + 2y) + 2y * (-7 + 2y)) = 12
((-7 * -7 + 2y * -7) + 2y * (-7 + 2y)) = 12
((49 + -14y) + 2y * (-7 + 2y)) = 12
(49 + -14y + (-7 * 2y + 2y * 2y)) = 12
(49 + -14y + (-14y + 4y2)) = 12

Combine like terms: -14y + -14y = -28y
(49 + -28y + 4y2) = 12

Solving
49 + -28y + 4y2 = 12

Solving for variable 'y'.

Reorder the terms:
49 + -12 + -28y + 4y2 = 12 + -12

Combine like terms: 49 + -12 = 37
37 + -28y + 4y2 = 12 + -12

Combine like terms: 12 + -12 = 0
37 + -28y + 4y2 = 0

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

Divide each side by '4'.
9.25 + -7y + y2 = 0

Move the constant term to the right:

Add '-9.25' to each side of the equation.
9.25 + -7y + -9.25 + y2 = 0 + -9.25

Reorder the terms:
9.25 + -9.25 + -7y + y2 = 0 + -9.25

Combine like terms: 9.25 + -9.25 = 0.00
0.00 + -7y + y2 = 0 + -9.25
-7y + y2 = 0 + -9.25

Combine like terms: 0 + -9.25 = -9.25
-7y + y2 = -9.25

The y term is -7y.  Take half its coefficient (-3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
-7y + 12.25 + y2 = -9.25 + 12.25

Reorder the terms:
12.25 + -7y + y2 = -9.25 + 12.25

Combine like terms: -9.25 + 12.25 = 3
12.25 + -7y + y2 = 3

Factor a perfect square on the left side:
(y + -3.5)(y + -3.5) = 3

Calculate the square root of the right side: 1.732050808

Break this problem into two subproblems by setting 
(y + -3.5) equal to 1.732050808 and -1.732050808.

Subproblem 1

y + -3.5 = 1.732050808 Simplifying y + -3.5 = 1.732050808 Reorder the terms: -3.5 + y = 1.732050808 Solving -3.5 + y = 1.732050808 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + y = 1.732050808 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + y = 1.732050808 + 3.5 y = 1.732050808 + 3.5 Combine like terms: 1.732050808 + 3.5 = 5.232050808 y = 5.232050808 Simplifying y = 5.232050808

Subproblem 2

y + -3.5 = -1.732050808 Simplifying y + -3.5 = -1.732050808 Reorder the terms: -3.5 + y = -1.732050808 Solving -3.5 + y = -1.732050808 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + y = -1.732050808 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + y = -1.732050808 + 3.5 y = -1.732050808 + 3.5 Combine like terms: -1.732050808 + 3.5 = 1.767949192 y = 1.767949192 Simplifying y = 1.767949192

Solution

The solution to the problem is based on the solutions from the subproblems. y = {5.232050808, 1.767949192}

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