Question

Which of the following can be used to find the absolute value of 4 - 7i?

Answer 1

The first one.


`|a+bi|=√(a^2+b^2)`

Answer 2

Option 1 is correct

Step-by-step explanation:

We have been given with the function 4 -7i

To find the absolute value means to find the modulus of the function.

And modulus of the function is
`√(a^2+b^2)`

Here we have a=4 and b= -7 so substituting the values in the formula we will get

`√(4^2+(-7)^2)`

Hence, Option 1 is correct

Option 2 is incorrect because we do not consider "i" in finding absolute value or modulus

Option 3 is incorrect because it should be -7 not 7

Option 4 is incorrect because it should not be whole square.

Therefore Option 1 is correct.