Question

square of (1-2i)please answer me fast​

Answer 1

Answer:

to find

( 1 -2i)²

= 1² + (-2i)² -2.1.-2i

= 1 +2i² +4i

= 1 + 2 (-1) +4i { since, i = √-1 => i² = -1}

= 1 -2 +4i

= -1 +4i.

this is the required answer.

I hope it will help you.

Step-by-step explanation:

formula used ; ( a -b)² = a² + b² -2ab....

$..$

Answer 2

Answer:

to find

( 1 -2i)²

= 1² + (-2i)² -2.1.-2i

= 1 +2i² +4i

= 1 + 2 (-1) +4i { since, i = √-1 => i² = -1}

= 1 -2 +4i

= -1 +4i.

this is the required answer.

I hope it will help you.

formula used ; ( a -b)² = a² + b² -2ab....