Please help me solve x

x is DA-DB

Step-by-step explanation:

Step-by-step explanation:

We are given a complex number of the form

a

+

i

b

and we need to compute the absolute value. Absolute value is always positive and it cannot be less than 0.

To compute the absolute value of a complex number, we'll use the rule

|

a

+

b

i

|

=

√

(

a

+

b

i

)

(

a

−

b

i

)

=

√

a

2

+

b

2

|

−

4

−

2

i

|

We know that

|

a

+

b

i

|

=

√

(

a

+

b

i

)

(

a

−

b

i

)

=

√

a

2

+

b

2

See full answer below.