Which equation results from taking the square root of both sides (x-9)^2=81

asked Feb 8, 2019 139k views

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4 votes

$(x-9)^2=81\\\\√((x-9)^2)=√(81)\\\\|x-9|=9\iff x-9=9\ \vee\ x-9=-9\ \ \ |+9\\\\x=19\ \vee\ x=0$

Whytespot answered Feb 9, 2019

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$\bf (x-9)^2=81\implies √((x-9)^2)=√(81)\implies x-9=\pm √(81) \\\\\\ x-9=\pm 9\implies x=\pm 9+9$

Rsanchez answered Feb 12, 2019

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