9+y^2=(y-4)(y-1)

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Solution for 9+y^2=(y-4)(y-1) equation:


Simplifying
9 + y2 = (y + -4)(y + -1)

Reorder the terms:
9 + y2 = (-4 + y)(y + -1)

Reorder the terms:
9 + y2 = (-4 + y)(-1 + y)

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

Combine like terms: -4y + -1y = -5y
9 + y2 = (4 + -5y + y2)

Add '-1y2' to each side of the equation.
9 + y2 + -1y2 = 4 + -5y + y2 + -1y2

Combine like terms: y2 + -1y2 = 0
9 + 0 = 4 + -5y + y2 + -1y2
9 = 4 + -5y + y2 + -1y2

Combine like terms: y2 + -1y2 = 0
9 = 4 + -5y + 0
9 = 4 + -5y

Solving
9 = 4 + -5y

Solving for variable 'y'.

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

Add '5y' to each side of the equation.
9 + 5y = 4 + -5y + 5y

Combine like terms: -5y + 5y = 0
9 + 5y = 4 + 0
9 + 5y = 4

Add '-9' to each side of the equation.
9 + -9 + 5y = 4 + -9

Combine like terms: 9 + -9 = 0
0 + 5y = 4 + -9
5y = 4 + -9

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

Divide each side by '5'.
y = -1

Simplifying
y = -1

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