Asked by Reina B.

(n+9)^2
n^2+81

(r-11)^2
r^2-22

(z+13)(z-13)
Z^2
Answered by Manny
(n+9) times (n+9)
FOIL n^2 +9n + 9n + 81 Do not forget the middle the O and the I

(r-11) times (r-11)

r^2 - 11r - 11r + 121

Can you guess why the third one is different? The positive and negative terms get rid of each other.
Answered by Anonymous
14
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