use the function rule f(x)=x*|-1|^x find the output f(2)

Question

A.4

B.3

C.-2

D.2

Answer 1

Remember P-E-M-D-A-S and evaluate absolute value [||] first (like you do Parentheses).

 

For x=2:

  f(2) = 2*|-1|^2                    P

  f(2) = 2*1                            E    (-1 squared is 1)

  f(2) = 2                               M

 

 

Just for fun, now try:

   f(x)=x*|-1|^x      to find f(3)