(y-1)(8-y)=16-(y-2)(y-2)

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Solution for (y-1)(8-y)=16-(y-2)(y-2) equation:


Simplifying
(y + -1)(8 + -1y) = 16 + -1(y + -2)(y + -2)

Reorder the terms:
(-1 + y)(8 + -1y) = 16 + -1(y + -2)(y + -2)

Multiply (-1 + y) * (8 + -1y)
(-1(8 + -1y) + y(8 + -1y)) = 16 + -1(y + -2)(y + -2)
((8 * -1 + -1y * -1) + y(8 + -1y)) = 16 + -1(y + -2)(y + -2)
((-8 + 1y) + y(8 + -1y)) = 16 + -1(y + -2)(y + -2)
(-8 + 1y + (8 * y + -1y * y)) = 16 + -1(y + -2)(y + -2)
(-8 + 1y + (8y + -1y2)) = 16 + -1(y + -2)(y + -2)

Combine like terms: 1y + 8y = 9y
(-8 + 9y + -1y2) = 16 + -1(y + -2)(y + -2)

Reorder the terms:
-8 + 9y + -1y2 = 16 + -1(-2 + y)(y + -2)

Reorder the terms:
-8 + 9y + -1y2 = 16 + -1(-2 + y)(-2 + y)

Multiply (-2 + y) * (-2 + y)
-8 + 9y + -1y2 = 16 + -1(-2(-2 + y) + y(-2 + y))
-8 + 9y + -1y2 = 16 + -1((-2 * -2 + y * -2) + y(-2 + y))
-8 + 9y + -1y2 = 16 + -1((4 + -2y) + y(-2 + y))
-8 + 9y + -1y2 = 16 + -1(4 + -2y + (-2 * y + y * y))
-8 + 9y + -1y2 = 16 + -1(4 + -2y + (-2y + y2))

Combine like terms: -2y + -2y = -4y
-8 + 9y + -1y2 = 16 + -1(4 + -4y + y2)
-8 + 9y + -1y2 = 16 + (4 * -1 + -4y * -1 + y2 * -1)
-8 + 9y + -1y2 = 16 + (-4 + 4y + -1y2)

Combine like terms: 16 + -4 = 12
-8 + 9y + -1y2 = 12 + 4y + -1y2

Add 'y2' to each side of the equation.
-8 + 9y + -1y2 + y2 = 12 + 4y + -1y2 + y2

Combine like terms: -1y2 + y2 = 0
-8 + 9y + 0 = 12 + 4y + -1y2 + y2
-8 + 9y = 12 + 4y + -1y2 + y2

Combine like terms: -1y2 + y2 = 0
-8 + 9y = 12 + 4y + 0
-8 + 9y = 12 + 4y

Solving
-8 + 9y = 12 + 4y

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Add '-4y' to each side of the equation.
-8 + 9y + -4y = 12 + 4y + -4y

Combine like terms: 9y + -4y = 5y
-8 + 5y = 12 + 4y + -4y

Combine like terms: 4y + -4y = 0
-8 + 5y = 12 + 0
-8 + 5y = 12

Add '8' to each side of the equation.
-8 + 8 + 5y = 12 + 8

Combine like terms: -8 + 8 = 0
0 + 5y = 12 + 8
5y = 12 + 8

Combine like terms: 12 + 8 = 20
5y = 20

Divide each side by '5'.
y = 4

Simplifying
y = 4

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