olivia1504 olivia1504
  • 09-03-2017
  • Mathematics
contestada

Does anyone know how to do this question ??

Does anyone know how to do this question class=

Respuesta :

santanafx
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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