menezessasha
menezessasha
16-08-2017
Mathematics
contestada
(r-1)^2
this is to the power of two
Respuesta :
Banabanana
Banabanana
16-08-2017
Use formula: (a-b)
² = a² - 2ab + b²
(r-1)
² =
r² - 2r + 1
Answer Link
kphung76127
kphung76127
16-08-2017
(r-1)^2= (r-1)(r-1)
Foil:
First: r*r=r^2
Outer: r*-1= -r
Inner: r*-1= -r
Last: -1*-1= 1
Put it together and simplify:
r^2-r-r+1
r^2-2r+1
Final answer: r^2-2r+1
Answer Link
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