Mathematics, 08.10.2019 06:30 LigmaXD
Which equation results from taking the square root of both sides of (x – 9)2 = 81? x – 9 = ±9 x + 9 = ±9 x + 3 = ±9 x – 3 = ±9
Answers: 2
![(x-9)^2=81\\\Rightarrow(x-9)^2-81=0\\\Rightarrow(x-9)^2-9^2=0\\\Rightarrow[(x-9)+9][(x-9)-9]=0.............by\ identity\ a^2-b^2=(a+b)(a-b)](/tpl/images/0299/5708/29dc0.png)
![\Rightarrow[(x-9)+9]=0\ or\ [(x-9)-9]=0\\\Rightarrow(x-9)=-9\ or\ (x-9)=9](/tpl/images/0299/5708/6298b.png)
, we get
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Which equation results from taking the square root of both sides of (x – 9)2 = 81? x – 9 = ±9 x + 9...
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