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

Answer»

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....

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