If ƒ(a,b) = 2a + 2b, all of the following are true for all values of a and b EXCEPT...

Question

A. ƒ(a,b) = (b,a)
B. ƒ(a, ƒ(a,b)) = ƒ(ƒ(a,b), b)
C. ƒ(a,0) = 2a
D. -ƒ(a,b) = ƒ(-a, -b)
E. ƒ(a,b) + ƒ(b,a) = ƒ(2a,2b)

 

Please help. Thank you.

Answer 1

A. If you mean f(a,b)=f(b,a), then 2a + 2b = 2b + 2a TRUE

B. 2a + 2(2a+2b) = 2(2a+2b) + 2b FALSE

C. 2a + 2*0 = 2a TRUE

D. -(2a+2b) = -2a - 2b TRUE

E. 2a+2b+2b+2a=2(2a)+2(2b) TRUE