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Pavlova-9 [17]
3 years ago
6

Does anyone know how to do this question ??

Mathematics
1 answer:
Viktor [21]3 years ago
4 0
Y^2-9^2

(y-9)(y+9)

To see if its right:

y*y+y*9-9*y-9*9
y^2+9y-9y-81
y^2-9^2
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