Find the protucts of each pair of complex conjugates. (4+5i)(4-5i)

(4 + 5i)(4 - 5i)

FOIL.

16 - 20i + 20i - 25i^2

Simplify.

16 - 25i^2

i^2 = -1

16 + 25

41

y = x + 9 ( in years)

Step-by-step explanation:

Given that Patrick is x years old and his brother is 9 years older than he is. Then;

His brother's age will be

= x + 9

If his brother is y years old then

y = x + 9

Since y is the subject, y has been expressed in terms of x. Where y is the age of Patrick's brother and x is Patrick's age.