JaneDoe911
JaneDoe911 JaneDoe911
  • 02-05-2018
  • Mathematics
contestada

(a-1)*(a+1) How does the expansion of this thing works?

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Meow321
Meow321 Meow321
  • 02-05-2018
This is a simple formula:(a-b)*(a+b)= a^2-b^2
And it goes like this for your example: (a-1)*(a+1)=a*a+a-a-1*1=a^2-1^2=a^2-1
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