dat destroyer QR question

[datgirl123]

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hey there guys,

i have a question in QR in dat destroyer question 38.

solve for x : radical x+5 = x -1

i solved it and got the roots as 4 and -1. i understand we have to plug it in. why is 4 the only answer? -1 could work. the square root of 4 could be + and - 2.

thanks!

 

[Crithu]

hey there guys,

i have a question in QR in dat destroyer question 38.

solve for x : radical x+5 = x -1

i solved it and got the roots as 4 and -1. i understand we have to plug it in. why is 4 the only answer? -1 could work. the square root of 4 could be + and - 2.

thanks!

The square root of -1 is i, an imaginary number.

 

[8_man]

the guy above nailed it