y(y+5)=y-15

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


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

Reorder the terms:
y(5 + y) = y + -15
(5 * y + y * y) = y + -15
(5y + y2) = y + -15

Reorder the terms:
5y + y2 = -15 + y

Solving
5y + y2 = -15 + y

Solving for variable 'y'.

Reorder the terms:
15 + 5y + -1y + y2 = -15 + y + 15 + -1y

Combine like terms: 5y + -1y = 4y
15 + 4y + y2 = -15 + y + 15 + -1y

Reorder the terms:
15 + 4y + y2 = -15 + 15 + y + -1y

Combine like terms: -15 + 15 = 0
15 + 4y + y2 = 0 + y + -1y
15 + 4y + y2 = y + -1y

Combine like terms: y + -1y = 0
15 + 4y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-15' to each side of the equation.
15 + 4y + -15 + y2 = 0 + -15

Reorder the terms:
15 + -15 + 4y + y2 = 0 + -15

Combine like terms: 15 + -15 = 0
0 + 4y + y2 = 0 + -15
4y + y2 = 0 + -15

Combine like terms: 0 + -15 = -15
4y + y2 = -15

The y term is 4y.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4y + 4 + y2 = -15 + 4

Reorder the terms:
4 + 4y + y2 = -15 + 4

Combine like terms: -15 + 4 = -11
4 + 4y + y2 = -11

Factor a perfect square on the left side:
(y + 2)(y + 2) = -11

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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