brad31 brad31
  • 04-05-2017
  • Mathematics
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What is the answer please

What is the answer please class=

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Alishameeks
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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