Question

|7-i|=?

Answer 1

need help

Answer 2

|7-i| = sqrt(7^2+1^2)=sqrt(49+1)=sqrt(50)=sqrt(25*2)=sqrt(25)*sqrt(2)=5*sqrt(2)


So |7-i| =5*sqrt(2)

Answer 3

i in this case is 1?

Answer 4

Oops made a slight typo (but the answer is still the same)


In the case of finding, |a+bi|, we simply use the formula

|a+bi| = sqrt(a^2+b^2)

In your case, a = 7 and b = -1

But notice how 1^2 = (-1)^2 = 1. So the typo did not affect the answer


So it should really be |7-i| = sqrt(7^2+(-1)^2)

Answer 5

ah ok I understand now. Thanks