Question

(5 - i)(5 + I)=

Answer choices:
26
25i
24

Answer 1

26

Explanation:

Answer 2

26

Explanation:

We can use difference of squares:

(5 - i)(5 + i) = 5^2 - i^2

i^2 = -1, so we have 25 - (-1) = 25 + 1 = 26