(y+3)(y-3)-y(y+5)=6

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Solution for (y+3)(y-3)-y(y+5)=6 equation:


Simplifying
(y + 3)(y + -3) + -1y(y + 5) = 6

Reorder the terms:
(3 + y)(y + -3) + -1y(y + 5) = 6

Reorder the terms:
(3 + y)(-3 + y) + -1y(y + 5) = 6

Multiply (3 + y) * (-3 + y)
(3(-3 + y) + y(-3 + y)) + -1y(y + 5) = 6
((-3 * 3 + y * 3) + y(-3 + y)) + -1y(y + 5) = 6
((-9 + 3y) + y(-3 + y)) + -1y(y + 5) = 6
(-9 + 3y + (-3 * y + y * y)) + -1y(y + 5) = 6
(-9 + 3y + (-3y + y2)) + -1y(y + 5) = 6

Combine like terms: 3y + -3y = 0
(-9 + 0 + y2) + -1y(y + 5) = 6
(-9 + y2) + -1y(y + 5) = 6

Reorder the terms:
-9 + y2 + -1y(5 + y) = 6
-9 + y2 + (5 * -1y + y * -1y) = 6
-9 + y2 + (-5y + -1y2) = 6

Reorder the terms:
-9 + -5y + y2 + -1y2 = 6

Combine like terms: y2 + -1y2 = 0
-9 + -5y + 0 = 6
-9 + -5y = 6

Solving
-9 + -5y = 6

Solving for variable 'y'.

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

Add '9' to each side of the equation.
-9 + 9 + -5y = 6 + 9

Combine like terms: -9 + 9 = 0
0 + -5y = 6 + 9
-5y = 6 + 9

Combine like terms: 6 + 9 = 15
-5y = 15

Divide each side by '-5'.
y = -3

Simplifying
y = -3

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