brad31
brad31
04-05-2017
Mathematics
contestada
What is the answer please
Respuesta :
Alishameeks
Alishameeks
04-05-2017
If
a ≥ 0
then
√a
denotes the non negative square root of
a
.
(x-9)^2 = (-(x-9))^2
So both
x−9
and
−
(x−9)
are square roots of
(x−9)
2
, but we want to pick whichever is non negative.
x−9
|
does that for us.
Answer should be √
(x-9)^2) = x-9
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