Question

what will the value of the expression (3-4i)*(3+4i) ​

Answer 1

Step-by-step explanation:

the value is 9+16=25.....

(a+b)(a-b)=a^2-b^2

so.., 3^2-4^2(i)^2

i..e., 9-16(i)^2

wkt,, i ^2=-1

so....9+16

=25