Question

Evaluate the function at the given value of the variable.

f(x) = √4 – 4(x) ; x = - 4, 11

Answer 1

For f(x)= √ 4-4(x); x=-4,11

f(-4)= √ 4-4(-4)

f(-4)= √ 4+16

f(-4)= √ 20

Will substitute 11 for x

f(x)= √ 4-4

f(11)= √ 4-4(11) (this becomes 44-4)

f(11)= √ -40

since -40 is a negative number, then f(11) is not a real number.
Do I have it correct?