Question

If f ( x ) = 3 - i and g ( x ) = 4i,

find f ( x ) g ( x )
Select one:
a. 12i + 3i
b. 11
c. 4i - 3i
d. 4 + 12i

Answer 1

`f(x)g(x) = (3 - i)(4i) \\ = 12i - 4 {i}^(2) \\ = \boxed{12i + 4 }\\ remember \:the \: value \: of \: {i}\: is \: √( - 1) \\ and \: {i}^(2) \: is - 1 \\ d. (4 + 12i)\: is \: the \: right \: answer.`