What is expand (x+y+1)(x-y-1) ?

The solution to expand (x+y+1)(x-y-1) is x^2-y^2-2y-1

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expand (x+y+1)(x-y-1)

expand

(x + y + 1) (x - y - 1)

x^{2} - y^{2} - 2 y - 1

Solution steps

(x + y + 1) (x - y - 1)

Distribute parentheses

= xx + x (- y) + x (- 1) + y x + y (- y) + y (- 1) + 1 \cdot x + 1 \cdot (- y) + 1 \cdot (- 1)

Simplify

xx + x (- y) + x (- 1) + y x + y (- y) + y (- 1) + 1 \cdot x + 1 \cdot (- y) + 1 \cdot (- 1) : x^{2} - y^{2} - 2 y - 1

= x^{2} - y^{2} - 2 y - 1

16 m + 15 m^{2} - 15

(- 25)

- 1 0^{- 2}

\frac{5}{2} - \frac{1}{3}

\frac{- 28 - 11 i}{10 - 9 i}

What is expand (x+y+1)(x-y-1) ?
The solution to expand (x+y+1)(x-y-1) is x^2-y^2-2y-1