(y-1)(y+1)-2*y(y+1)=-y*y

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Solution for (y-1)(y+1)-2*y(y+1)=-y*y equation:


Simplifying
(y + -1)(y + 1) + -2y(y + 1) = -1y * y

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

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

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

Combine like terms: -1y + 1y = 0
(-1 + 0 + y2) + -2y(y + 1) = -1y * y
(-1 + y2) + -2y(y + 1) = -1y * y

Reorder the terms:
-1 + y2 + -2y(1 + y) = -1y * y
-1 + y2 + (1 * -2y + y * -2y) = -1y * y
-1 + y2 + (-2y + -2y2) = -1y * y

Reorder the terms:
-1 + -2y + y2 + -2y2 = -1y * y

Combine like terms: y2 + -2y2 = -1y2
-1 + -2y + -1y2 = -1y * y

Multiply y * y
-1 + -2y + -1y2 = -1y2

Add 'y2' to each side of the equation.
-1 + -2y + -1y2 + y2 = -1y2 + y2

Combine like terms: -1y2 + y2 = 0
-1 + -2y + 0 = -1y2 + y2
-1 + -2y = -1y2 + y2

Combine like terms: -1y2 + y2 = 0
-1 + -2y = 0

Solving
-1 + -2y = 0

Solving for variable 'y'.

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

Add '1' to each side of the equation.
-1 + 1 + -2y = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -2y = 0 + 1
-2y = 0 + 1

Combine like terms: 0 + 1 = 1
-2y = 1

Divide each side by '-2'.
y = -0.5

Simplifying
y = -0.5

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