Question

X³,

Determine f(3) for f(x) = 2x²-9,
5x+4,
09
O 19
O22
O 27
X<-4
-4 X≥ 3

Answer 1

f(3)=19

Explanation:

f(x)=f(3), so x=3

f(x) has three function depend on x, When x=3 it belongs to the interval x>=3 so we use the function f(x)=5x+4 and x=3

=> f(3)=5*3+4=19