Question

Find the product of (7 - 11i) and its conjugate. product =

Answer 1

the conjugate it's the same numbers, but the imaginary one, with the opposite sign, so will be:

(7-11i)*(7+11i)

you distribute the numbers

7*7+7*(11i)-7*(11i)-(11i)*(11i) (the bold ones, annulate each other)

`49-121i^2`

and i2 = -1

so 49 -121* (-1)

49+121= 170

So the answer is: 170