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Does anyone know how to do this question ??
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3 votes
Does anyone know how to do this question ??

Does anyone know how to do this question ??-example-1
User Tabia
by
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1 Answer

3 votes
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
User Thierno
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9.5k points
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