Question

calculate the absolute value of 4-9i

Answer 1

what?

Answer 2

\[\left| x \right|= -x\]
and \[x\]
So what would \[\left| 4-9i \right|\] be equal to?

Answer 3

Oh and I meant \[-x \]OR \[x \]not and

Answer 4

-4+9i

Answer 5

it's \[-(4+i)\]

Answer 6

what happens to the 9?

Answer 7

That was a typo. The 9 remains. But remember, the absolute value equals two values.

Answer 8

so -4-9i

Answer 9

that's not how that works

Answer 10

it's
\[\sqrt{4^2+9^2}\]

Answer 11

it's the square root of the real part squared plus the imaginary part squared.

Answer 12

sqrt 97?

Answer 13

Oh yea, he's actually right. It's equal to the absolute value mean distance.
But then the absolute property that I told you still holds in other questions.

Answer 14

That's right.

Answer 15

What you said only holds for real x.

Answer 16

Yes I realised that.

Answer 17

great

Answer 18

You would also probably need an equals to something in most cases.