help

[wicked totem]

Hello can anyone explain (8)&(9) to me? I still am bewildered after reading the explanation, do I just memorise it like a rule? Just like the square root of a known positive number must only be positive even tho (-n)^2=n^2?

[somber fulcrum]

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[young patio]

Lmao the textbook is messing with you

For a hint try finding all the values of the set

${x|x\in\bR,x^2+1=0}$

[tame heron]

Ravi#Justice4Viata#NoLifer

[wicked totem]

Thank you!

[sly bison]

doesnt exist 😂