olivia1504
olivia1504
09-03-2017
Mathematics
contestada
Does anyone know how to do this question ??
Respuesta :
santanafx
santanafx
09-03-2017
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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