(y-5)(y-9)=15

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Solution for (y-5)(y-9)=15 equation:


Simplifying
(y + -5)(y + -9) = 15

Reorder the terms:
(-5 + y)(y + -9) = 15

Reorder the terms:
(-5 + y)(-9 + y) = 15

Multiply (-5 + y) * (-9 + y)
(-5(-9 + y) + y(-9 + y)) = 15
((-9 * -5 + y * -5) + y(-9 + y)) = 15
((45 + -5y) + y(-9 + y)) = 15
(45 + -5y + (-9 * y + y * y)) = 15
(45 + -5y + (-9y + y2)) = 15

Combine like terms: -5y + -9y = -14y
(45 + -14y + y2) = 15

Solving
45 + -14y + y2 = 15

Solving for variable 'y'.

Reorder the terms:
45 + -15 + -14y + y2 = 15 + -15

Combine like terms: 45 + -15 = 30
30 + -14y + y2 = 15 + -15

Combine like terms: 15 + -15 = 0
30 + -14y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-30' to each side of the equation.
30 + -14y + -30 + y2 = 0 + -30

Reorder the terms:
30 + -30 + -14y + y2 = 0 + -30

Combine like terms: 30 + -30 = 0
0 + -14y + y2 = 0 + -30
-14y + y2 = 0 + -30

Combine like terms: 0 + -30 = -30
-14y + y2 = -30

The y term is -14y.  Take half its coefficient (-7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
-14y + 49 + y2 = -30 + 49

Reorder the terms:
49 + -14y + y2 = -30 + 49

Combine like terms: -30 + 49 = 19
49 + -14y + y2 = 19

Factor a perfect square on the left side:
(y + -7)(y + -7) = 19

Calculate the square root of the right side: 4.358898944

Break this problem into two subproblems by setting 
(y + -7) equal to 4.358898944 and -4.358898944.

Subproblem 1

y + -7 = 4.358898944 Simplifying y + -7 = 4.358898944 Reorder the terms: -7 + y = 4.358898944 Solving -7 + y = 4.358898944 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + y = 4.358898944 + 7 Combine like terms: -7 + 7 = 0 0 + y = 4.358898944 + 7 y = 4.358898944 + 7 Combine like terms: 4.358898944 + 7 = 11.358898944 y = 11.358898944 Simplifying y = 11.358898944

Subproblem 2

y + -7 = -4.358898944 Simplifying y + -7 = -4.358898944 Reorder the terms: -7 + y = -4.358898944 Solving -7 + y = -4.358898944 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + y = -4.358898944 + 7 Combine like terms: -7 + 7 = 0 0 + y = -4.358898944 + 7 y = -4.358898944 + 7 Combine like terms: -4.358898944 + 7 = 2.641101056 y = 2.641101056 Simplifying y = 2.641101056

Solution

The solution to the problem is based on the solutions from the subproblems. y = {11.358898944, 2.641101056}

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