Question

Which is the simplified product of (6−i)(6+i) ?

Answer 1

(6−i)(6+i) =36-i²

we apply the difference of squares formula, i.e. (a-b)(a+b)=a²-b².

a=6 b=i.

(6-i)(6+1)= 6²-i² = 36-i²

Explanation: