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3 years ago

6

Does anyone know how to do this question ??

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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